20 Best Uniden Radio Scanners [2024]

Are you looking for the best uniden radio scanners? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling uniden radio scanners.

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# Preview Product
1 Uniden Bearcat BC125AT Handheld Scanner, 500-Alpha-Tagged Channels, Close Call Technology, PC... Uniden Bearcat BC125AT Handheld Scanner, 500-Alpha-Tagged Channels, Close Call Technology, PC...
2 Uniden BCD436HP HomePatrol Series Digital Handheld Scanner. TrunkTracker V, Simple Programming,... Uniden BCD436HP HomePatrol Series Digital Handheld Scanner. TrunkTracker V, Simple Programming,...
3 Uniden BC355N 800 MHz 300-Channel Base/Mobile Scanner, Close Call RF Capture, Pre-programmed Search... Uniden BC355N 800 MHz 300-Channel Base/Mobile Scanner, Close Call RF Capture, Pre-programmed...
4 Uniden BC365CRS 500 Channel Scanner and Alarm Clock with Snooze, Sleep, and FM Radio with Weather... Uniden BC365CRS 500 Channel Scanner and Alarm Clock with Snooze, Sleep, and FM Radio with Weather...
5 Uniden BCD996P2 Digital Mobile TrunkTracker V Scanner, 25,000 Dynamically Allocated Channels, Close... Uniden BCD996P2 Digital Mobile TrunkTracker V Scanner, 25,000 Dynamically Allocated Channels,...
6 Uniden Bearcat SR30C, 500-Channel Compact Handheld Scanner, Close Call RF Capture, Turbo Search, PC... Uniden Bearcat SR30C, 500-Channel Compact Handheld Scanner, Close Call RF Capture, Turbo Search,...
7 Uniden HomePatrol-2 Color Touchscreen Simple Program Digital Scanner, TrunkTracker V and S,A,M,E,... Uniden HomePatrol-2 Color Touchscreen Simple Program Digital Scanner, TrunkTracker V and S,A,M,E,...
8 Uniden BCD536HP HomePatrol Series Digital Phase 2 Base/Mobile Scanner with HPDB and Wi-Fi. Simple... Uniden BCD536HP HomePatrol Series Digital Phase 2 Base/Mobile Scanner with HPDB and Wi-Fi. Simple...
9 Uniden BCD325P2 Handheld TrunkTracker V Scanner. 25,000 Dynamically Allocated Channels. Close Call... Uniden BCD325P2 Handheld TrunkTracker V Scanner. 25,000 Dynamically Allocated Channels. Close...
10 Uniden BEARTRACKER 885 Hybrid Full-Featured CB Radio + Digital TrunkTracking... Uniden BEARTRACKER 885 Hybrid Full-Featured CB Radio + Digital TrunkTracking...
11 Uniden SDS100 True I/Q Digital Handheld Scanner, Designed for Improved Digital Performance in... Uniden SDS100 True I/Q Digital Handheld Scanner, Designed for Improved Digital Performance in...
12 Uniden PRO501HH Pro-Series 40-Channel Portable Handheld CB Radio/Emergency/Travel Radio, Large LCD... Uniden PRO501HH Pro-Series 40-Channel Portable Handheld CB Radio/Emergency/Travel Radio, Large...
13 Trunking Scanners for Beginners: Using FreeSCAN and the Uniden TrunkTracker (Amateur Radio for... Trunking Scanners for Beginners: Using FreeSCAN and the Uniden TrunkTracker (Amateur Radio for...
14 UNIDEN BCD536HP Bearcat Digital Base/Mobile Scanner UNIDEN BCD536HP Bearcat Digital Base/Mobile Scanner
15 Bingfu 20-1300MHz Police Scanner Antenna Radio Scanner Magnetic Base Antenna HF VHF UHF Two Way Ham... Bingfu 20-1300MHz Police Scanner Antenna Radio Scanner Magnetic Base Antenna HF VHF UHF Two Way...
16 Uniden Atlantis 155 Handheld Two-Way VHF Marine Radio, Floating IPX7 Submersible Waterproof,... Uniden Atlantis 155 Handheld Two-Way VHF Marine Radio, Floating IPX7 Submersible Waterproof,...
17 Uniden BEARCAT 980 40- Channel SSB CB Radio with Sideband NOAA WeatherBand,7- Color Digital Display... Uniden BEARCAT 980 40- Channel SSB CB Radio with Sideband NOAA WeatherBand,7- Color Digital...
18 Bingfu VHF UHF Car Truck Police Scanner Adhesive Mount Antenna Vehicle Ham Radio Amateur Radio... Bingfu VHF UHF Car Truck Police Scanner Adhesive Mount Antenna Vehicle Ham Radio Amateur Radio...
19 Uniden MHS75 Waterproof Handheld 2-Way VHF Marine radio, Submersible, Selectable 1/2.5/5 Watt... Uniden MHS75 Waterproof Handheld 2-Way VHF Marine radio, Submersible, Selectable 1/2.5/5 Watt...
20 Bingfu Police Radio Scanner Antenna 20-1300MHz 7 Sections Telescopic BNC Male Antenna Ham Radio... Bingfu Police Radio Scanner Antenna 20-1300MHz 7 Sections Telescopic BNC Male Antenna Ham Radio...
SaleBestseller No. 1
Uniden Bearcat BC125AT Handheld Scanner, 500-Alpha-Tagged Channels, Close Call Technology, PC...
  • LISTEN IN AND STAY INFORMED, this sophisticated scanner has 500 alpha-tagged channels in a convenient compact design with loads of features. Close...
  • LISTEN TO OVER 40,000 FREQUENCIES, you can listen to both civilian and military bands, including Non-Digital Police, Ambulance, Fire, Weather, Marine,...
  • SEARCH MORE EFFICIENTLY with 500 Alpha-Tagged Channels finding the channel you want to listen to is easy, with 500 channels divided into 10 storage...
  • LIGHTWIEGHT PORTABLE DESIGN, take this Bearcat handheld radio scanner with you on the road, or on outings. It packs plenty of features, the orange...
  • GET STARTED LISTENING RIGHT AWAY with convenient Pre-sets for the most popular searches. Frequencies are preset in ten separate Non -Digital...
SaleBestseller No. 2
Uniden BCD436HP HomePatrol Series Digital Handheld Scanner. TrunkTracker V, Simple Programming,...
  • The BCD436HP is the first scanner to incorporate the HomePatrol-1 ease of use in a traditional handheld scanner. Plus, Uniden's exclusive Close Call...
  • Simple to operate, no programming needed. Simply turn it on, enter your zip code, and TrunkTracker V does the rest.
  • This user-friendly digital scanner will immediately begin receiving communications used by Public Safety, Police, Fire, EMS, Ambulance, Aircraft,...
  • This functionality is made possible by combining the rich radio system database from Radio Reference with Uniden's patented radio system selection...
  • Whether it is across town or across the street, the BCD436HP keeps you informed. Now with the largest display on the market and more advanced...
SaleBestseller No. 3
Uniden BC355N 800 MHz 300-Channel Base/Mobile Scanner, Close Call RF Capture, Pre-programmed Search...
  • The Uniden Bearcat BC355N Mobile/Base Scanner is one of the most feature packed, user-friendly, entry level scanners available today. It can pick up...
  • The BC355N features “Close Call RF Capture Technology,” which instantly tunes to signals from nearby transmitters. This pre-programmed search...
  • You can save up to 300 frequencies that are scanned along with the preset frequencies. So whenever you encounter a newly activated local frequency for...
  • The BC355N comes complete with a backlit display, making it easier to read in low light conditions, along with AC adapter, a DC power cable and an...
  • If you’re looking for an affordable way to jump into the world of scanners, the BC355N may be the right choice for you. (Please note: model BC355N...
SaleBestseller No. 4
Uniden BC365CRS 500 Channel Scanner and Alarm Clock with Snooze, Sleep, and FM Radio with Weather...
  • LISTEN IN AND STAY INFORMED! The Uniden BC365CRS is an affordable 500 channel all-in-one conventional Analog Scanner, Alarm Clock, and FM Radio with...
  • 500 CHANNELS: Get started listening right away with convenient pre-sets for the most popular searches, Non-Digital Police/Fire/Emergency, Weather...
  • BUILT-IN FM RADIO & ALARM CLOCK: Save up to 30 FM stations in preset memories so you can instantly tune to your favorite local broadcast. Alarm Clock...
  • ATTRACTIVE DESIGN: Ideal for Home Use. This all-in-one scanner features a fresh design that's attractive on your desktop and easy to read at night...
  • PRIORITY with DO-NOT-DISTURB: Store your most important frequencies into priority channels. When scanning, these channels are checked every 2 seconds,...
SaleBestseller No. 5
Uniden BCD996P2 Digital Mobile TrunkTracker V Scanner, 25,000 Dynamically Allocated Channels, Close...
  • Uniden's BCD996P2 Digital Base/Mobile Scanner is a full-featured design with the serious hobbyist in mind. With an advanced digital decoding system...
  • The BCD996P2 comes equipped with Uniden exclusive features like Advanced Dynamic Memory System, Close Call RF Capture Technology, and GPS...
  • Stay safe and informed with state of the art NOAA weather access and S.A.M.E. weather alerts that warn you of severe conditions in your area.
  • This mobile scanner radio offers 25,000 channels an advanced dynamic memory system, TrunkTracker V technology, and more. Enjoy location-based scanning...
  • Included in the Box: BCD996P2 Scanner, AC Power Adapter, Vehicle Accessory Power Cord, Three-Wire Harness, Mounting Bracket and Hardware, Antenna,...
SaleBestseller No. 6
Uniden Bearcat SR30C, 500-Channel Compact Handheld Scanner, Close Call RF Capture, Turbo Search, PC...
  • LISTEN IN AND STAY INFORMED! The Uniden Bearcat SR30C is a very affordable 500 channel hand-held scanner with loads of features in a convenient...
  • LISTEN TO OVER 32,000 FREQUENCIES: Get started listening right away with convenient pre-sets for the most popular searches. Frequencies are preset in...
  • PC PROGRAMING lets you program your scanner using your PC. Close call RF capture technology instantly tunes to signals from nearby transmitters and...
  • DELAY FUNCTION helps prevent missed replies during two-way conversations. Other features include keypad entry, Earphone Jack, key lock, battery low...
  • THREE POWER OPTIONS: #1- The included USB cable will power your SR30C from your PC or other USB power source, such as a smart phone USB charger (not...
SaleBestseller No. 7
Uniden HomePatrol-2 Color Touchscreen Simple Program Digital Scanner, TrunkTracker V and S,A,M,E,...
  • The Uniden HomePatrol-2 is one of the most popular Digital Police scanners on the market. This model lets you quickly hear communications systems used...
  • Simply enter your zip code and Home Patrol-2 does the rest. Whether it is across town or across the street, HomePatrol-2 keeps you informed.
  • Digital Capable, receives all unencrypted, non-proprietary radio systems including APCO-25 Phase I and Phase II digital, Motorola, EDACS, LTR,...
  • Included In The Box: HomePatrol-2 Scanner, Flex Antenna, Desk Stand, USB Cable, 4 x AA NiMH Rechargeable Batteries, SMA to BNC Adapter.
  • Please note: an AC or DC power adapter is NOT included. To power the unit and/or charge the NiMH batteries, it comes with a USB cable. Please use this...
Bestseller No. 8
Uniden BCD536HP HomePatrol Series Digital Phase 2 Base/Mobile Scanner with HPDB and Wi-Fi. Simple...
  • The BCD536HP continues Uniden's tradition of leading innovation. Home Patrol Programming makes it the easiest-to-program mobile professional scanner...
  • Plus, the Wi-Fi feature lets you use the exclusive Uniden Siren App on your smartphone or tablet to access your scanner from anywhere in your home or...
  • The 536HP digital Trunk Tracker V is the first full mobile/desktop unit that requires no user programming. Simply turn it on, enter your zip code and...
  • This user friendly digital scanner will immediately begin receiving communications systems used by Public Safety, Police, Fire, EMS, Ambulance,...
  • This functionality is made possible by combining the rich radio system database from Radio Reference with Uniden's patented radio system selection...
Bestseller No. 9
Uniden BCD325P2 Handheld TrunkTracker V Scanner. 25,000 Dynamically Allocated Channels. Close Call...
  • The BCD325P2 comes equipped with Uniden exclusive features like Advanced Dynamic Memory System, Close Call RF Capture Technology, and GPS...
  • Scan and search 25,000 channels. With Close Call RF capture technology, this scanner will automatically tune to the signals nearest you, so you can...
  • Quick-Key System Access (100 Keys), allows you to quickly access the systems you us the most often. Uniden Police Scanners feature simple to set up...
  • GPS Location-Based Scanning, connect this scanner to an optional GPS receiver and it will automatically select programmed systems based on your exact...
  • S.A.M.E. Weather Alert, supports Specific Area Message Encoding weather alerts. During a NOAA Weather or Emergency Alert, a code for your specific...
SaleBestseller No. 10
Uniden BEARTRACKER 885 Hybrid Full-Featured CB Radio + Digital TrunkTracking...
  • The BearTracker 885 does what no other CB Radio can do: It can keep you up-to-date with current public safety activity in US and Canada by scanning...
  • BearTracker Warning System, Alerts you when nearby public safety transmissions are detected. Included GPS allows you to automatically select nearby...
  • Full-featured CB Radio with 40-channel CB operation, 4-Watt RF power, a 7-color display, a SWR meter for precision antenna tuning, RF Gain, Mic Gain,...
  • The Scanner feature operates alongside the CB radio features, there is no switching back and forth between modes; just press a button and you’re...
  • The ergonomic noise cancelling microphone is designed to enhance your transmissions, even in the noise environment of a tractor-trailer cab.
Bestseller No. 11
Uniden SDS100 True I/Q Digital Handheld Scanner, Designed for Improved Digital Performance in...
  • SDS100: True I/Q receiver design for improved digital performance in weak-signal and simulcast areas
  • SDS100: Rugged/ weather resistant jis 4 construction
  • SDS100: Li-Ion battery
  • SDS100: Improved UI with 3 contextual soft keys that Change function based on the current operation
  • SDS100: Customizable color LCD: user can modify color and what is displayed
Bestseller No. 12
Uniden PRO501HH Pro-Series 40-Channel Portable Handheld CB Radio/Emergency/Travel Radio, Large LCD...
  • The Uniden Pro-Series PRO501HH compact handheld CB radio offers high-performance full 40-Channel CB operation and 10 weather channels in a compact...
  • Extremely popular for industrial commercial and off-road use Use high power to punch out the strongest signal or low power to preserve battery life...
  • Noaa weather keeps you informed when severe weather threatens And the dual watch feature lets you talk on one channel while keeping an ear on another...
  • Built-in anl (automatic noise limiter) and squelch control fine-tune performance and eliminate noise External speaker jack and external mic jack Large...
  • Package includes antenna w/ bnc connector belt clip hand Strap owner’s manual cigarette plug adapter for both charging Ni-MH batteries and/or...
Bestseller No. 13
Trunking Scanners for Beginners: Using FreeSCAN and the Uniden TrunkTracker (Amateur Radio for...
  • Schell, Brian (Author)
  • English (Publication Language)
  • 62 Pages - 11/17/2018 (Publication Date) - Independently published (Publisher)
Bestseller No. 15
Bingfu 20-1300MHz Police Scanner Antenna Radio Scanner Magnetic Base Antenna HF VHF UHF Two Way Ham...
  • Frequency Range: 20MHz - 1300MHz; Compatible with: Public Radio Scanner, Ham Radio, Two Way Radio, Walkie Talkie, Mobile Radio; VSWR: < 2.0;...
  • Compatible with Uniden Radio Scanner: SR30C, Bearcat BC125AT, BCD436HP, BC75XLT, BCD325P2, BC355N, BCD996P2, BC365CRS, BCT15X, BCD536HP, BC345CRS,...
  • Compatible with Whistler Radio Scanner: WS1040 WS1088 WS1010 WS1080 WS1025 WS1065 TRX1 TRX2;
  • Compatible with Radio Shack Radio Scanner: PRO-2018 PRO-197 PRO-650 PRO-163 PRO-405 PRO-528 PRO-668 PRO-94 PRO-404 PRO-95 PRO-62 PRO-83;
  • Compatible with Ham Radio: Kenwood TK100, TK200, TK210, TK220, TK300, TK310, TK320; Icom: IC-V8, IC-V80, IC-V82, IC-U82 ,IC-W32; Motorola: HT440,...
SaleBestseller No. 16
Uniden Atlantis 155 Handheld Two-Way VHF Marine Radio, Floating IPX7 Submersible Waterproof,...
  • The Atlantis 155’s submersible, Floating Handheld design allows you to stay secure and connected while having fun on the water.
  • With the Largest LCD screen in its class 25mm (h) x 40mm (w), and Paper White Backlight display for Day Time, and Red Backlight display for Night...
  • When every inch of space count, you still want the important features that will keep you safe at sea. The Atlantis 155 doesn’t sacrifice big...
  • It Floats, meets the toughest Waterproof standards IPX8 / JIS8, and even clears its speaker of water after being submerged. And with its compact size...
  • Receives all Marine Radio Channels, including all USA, Canada, and International Marine VHF channels (includes the new 4-digit channels and Canadian...
SaleBestseller No. 17
Uniden BEARCAT 980 40- Channel SSB CB Radio with Sideband NOAA WeatherBand,7- Color Digital Display...
  • STAY CONNECTED: The BEARCAT 980 SSB CB Radio allows you to stay connected while out on the road and is great for people with a long drive ahead of...
  • LARGE EASY-TO-READ DISPLAY & CHANNEL: Illuminated control panel with 7 color personalized display options for easy use in all lighting conditions....
  • 40 CHANNEL: Full spectrum CB operation & instantly switches to emergency channel 9. Features NOAA weather channels with the push of a button
  • NEW NOISE CANCELLING MICROPHONE: Noise Canceling Mic reduces background noise for crystal clear communication
  • WIRELESS MICROPHONE COMPATABILE: The integrated SWR gives perfect antenna matching. Working with the Uniden BC906W CB Wireless Microphone the Bearcat...
Bestseller No. 18
Bingfu VHF UHF Car Truck Police Scanner Adhesive Mount Antenna Vehicle Ham Radio Amateur Radio...
  • Frequency Range: 20MHz - 1300MHz; Compatible with: Public Radio Scanner, Ham Radio, Two Way Radio, Walkie Talkie, Mobile Radio; VSWR: < 2.0;...
  • Package List: 1 x Antenna (As the Picture Shown);
  • Compatible with Uniden Radio Scanner: SR30C, Bearcat BC125AT, BCD436HP, BC75XLT, BCD325P2, BC355N, BCD996P2, BC365CRS, BCT15X, BCD536HP, BC345CRS,...
  • Compatible with Whistler Radio Scanner: WS1040 WS1088 WS1010 WS1080 WS1025 WS1065 TRX1 TRX2;
  • Compatible with Radio Shack Radio Scanner: PRO-2018 PRO-197 PRO-650 PRO-163 PRO-405 PRO-528 PRO-668 PRO-94 PRO-404 PRO-95 PRO-62 PRO-83;
SaleBestseller No. 19
Uniden MHS75 Waterproof Handheld 2-Way VHF Marine radio, Submersible, Selectable 1/2.5/5 Watt...
  • JIS8 Waterproof Level - Uniden MHS75 VHF Hand Held Radio won't give up no matter how wet it gets. Whitecap splash, gusty spray, tidal wave, whatever,...
  • 1 /2.5/5 Watt Switchable - Select between 1, 2.5, and 5 Watts for short- and long-range communication - this is also a convenient way to save a little...
  • All USA, International, and Canada Channels - The MHS75 covers all USA, International, and Canadian marine channels, keeping you up-to-date with all...
  • All NOAA Weather Channels with Weather Alert - This radio comes preprogrammed with NOAA weather channels. The Emergency/Weather Alert allows it to...
  • Instant Channel 16/9/Triple Watch - Triple Watch mode monitors channels 16 and 9 for a signal while you listen to the currently selected channel. The...
Bestseller No. 20
Bingfu Police Radio Scanner Antenna 20-1300MHz 7 Sections Telescopic BNC Male Antenna Ham Radio...
  • Frequency Range: 20MHz - 1300MHz; 7 Sections; Length: 20cm - 115cm; VSWR: < 2.0; Impedance: 50 ohm; Antenna Connector: BNC Male Connector;
  • Compatible with: Police Radio Scanner, Ham Radio, Two Way Radio, Amateur Radio, Portable Handheld CB Radio, Wireless Microphone System, Frequency...
  • Easy to install, compatible with handheld, indoor and mobile radios, scanners, the antenna body can be bent to 90 degrees, easy to carry.
  • Package List: 1 x Antenna (As the Picture Shown);
  • Compatible with Uniden, Whistler Police Radio Scanners and Cobra, Uniden, Midland and Maxon Portable Handheld CB Radios.

Having trouble finding a great uniden radio scanners?

This problem is well understood by us because we have gone through the entire uniden radio scanners research process ourselves, which is why we have put together a comprehensive list of the best uniden radio scannerss available in the market today.

After hours of searching and using all the models on the market, we have found the best uniden radio scanners for 2023. See our ranking below!

How Do You Buy The Best Uniden Radio Scanners?

Do you get stressed out thinking about shopping for a great uniden radio scanners? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching uniden radio scanners, which is why we have assembled a comprehensive list of the greatest uniden radio scanners available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for uniden radio scanners that you consider buying. Your questions might include the following:

  • Is it worth buying an uniden radio scanners?
  • What benefits are there with buying an uniden radio scanners?
  • What factors deserve consideration when shopping for an effective uniden radio scanners?
  • Why is it crucial to invest in any uniden radio scanners, much less the best one?
  • Which uniden radio scanners are good in the current market?
  • Where can you find information like this about uniden radio scanners?

We’re convinced that you likely have far more questions than just these regarding uniden radio scanners, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for uniden radio scanners, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible uniden radio scanners. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an uniden radio scanners buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available uniden radio scanners currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of uniden radio scanners has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an uniden radio scanners?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your uniden radio scanners.
  5. Customer Ratings: Number ratings grade uniden radio scanners objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their uniden radio scanners.
  7. Product Quality: You don’t always get what you pay for with an uniden radio scanners, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an uniden radio scanners is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining uniden radio scanners information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding uniden radio scanners is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

FAQ:

Q: What is the best digital police scanner?

A: Analog – these are the oldest scanners available,capable of detecting analog signals only. Trunked – this is a two-way system that uses digital control to assign frequencies Phase 1 Digital –uses a 12.5 kHz digital signal per single user to transmit and receive signals

Q: How do you set the frequencies for Uniden scanners?

A: For single Site Systems programming them as DQK 0 is simplest see System 7 above. For multi Sites you can make all sites DQK 0,or use any other DQK available,try not to make them the same as a regularly activated/inactivated DQK or Nothing … To activate Favorites List 1,press 1 or 01 and e

Q: What is analog police scanner?

A: Analog or conventional police scanners pick up analog (non-digital) radio transmissions. A keypad allows frequencies to be entered and stored in the scanner’s memory. Many smaller cities and rural areas use analog radio transmissions. Analog Trunking-capable Scanners. In large cities, trunked radio systems allow more users to share the same …

Q: What is a digital radio scanner?

A: A scanner (also referred to as a radio scanner) is a radio receiver that can automatically tune, or scan, two or more discrete frequencies, stopping when it finds a signal on one of them and then continuing to scan other frequencies when the initial transmission ceases.

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