Uniden UM50 FN FirstNet Vehicle Cell Signal Booster Kit | 7021FN

Uniden UM50 FN FirstNet Vehicle Cell Signal Booster

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  • Mobile public safety signal booster for first responder vehicles
  • Amplifies 700 MHz FirstNet band 14 & AT&T band 12
  • Improves signal for up to 20 phones in the same vehicle
  • Includes 12V DC socket power supply & 12V DC hardwire power supply


Free lifetime support
SKU: 7021FN

Product Description

This product has been discontinued. Please see our other mobile cell signal boosters.

Features of the Uniden UM50 FN

  • Provides emergency cellular communications for police, fire, and medical personnel in cars, trucks, and other vehicles.
  • Works with AT&T’s FirstNet cellular network.
  • The Uniden booster installs easily under your seat or in any other convenient, well-ventilated spot. Mounting holes allow you to secure the booster to drillable surfaces.
  • Includes a 12V DC socket power supply and a 12V DC hardwire power supply—use whichever power supply meets your vehicle’s needs.
  • Boosts service for voice, text, and data.
  • Boosts cell signal for multiple users simultaneously.

FirstNet is a high-speed, nationwide wireless broadband network maintained by AT&T for public safety communications. This network has dedicated cellular frequencies for law enforcement, firefighters, ambulances, and other first responders and public safety agencies.

The Uniden UM50 FN cell phone signal booster helps you stay connected and experience fewer dropped calls, undelivered texts, and missed email messages at all times, including during emergencies. It amplifies FirstNet band 14 and AT&T band 12.

Stay connected farther from cell towers and experience fewer dropped calls, undelivered texts, and missed email messages. Data-driven navigation and other apps will perform better in remote areas with weak cell service and obstructions between your car and the cell tower.

Uniden UM50 FN FirstNet mobile cellular booster The Uniden UM50 FN is the only mobile cellular booster that works with AT&T’s FirstNet network for first responders.

Who is the Uniden UM50 FN for?

  • Police departments, sheriffs, and other law enforcement agency vehicles.
  • Fire trucks and ambulances.
  • Personal vehicles used by police chiefs, fire chiefs, and other key personnel who need improved FirstNet reception on the road.
  • First responder vehicles operating in remote locations with weak cell service (new communities, rural areas, etc.)


Installation of the Uniden UM50 FN can be completed in about 30 minutes. (See Documentation, below, to download the installation guide.)

Uniden UM50 FN FirstNet vehicle cell signal booster setup diagram Typical setup of the Uniden UM50 FN (click to enlarge)

Uniden UM50 FN kit contents

This is a complete kit, with everything you need to start getting the best signal in your vehicle:

Uniden UM50 FN booster 7021FN icon Uniden UM50 FN cell signal amplifier 7021FN
Uniden UM50 FN magnetic-mount antenna icon Magnet‑mount outside antenna w/10′ RG58 coax cable
Uniden UM50 FN patch antenna icon Adhesive‑mount inside patch antenna w/10′ RG174 coax cable
Uniden UM50 FN 12V DC/DC power supply icon 12V DC/DC power supply w/1′ coiled cable (extends to 4′ max)
Uniden UM50 FN 12V DC hardwire power supply icon 12V DC hardwire power supply w/10′ cable & inline fuse

Works with the AT&T FirstNet network

The Uniden UM50 FN FirstNet booster system works only on AT&T’s FirstNet cellular networkexternal link icon, which includes two bands of frequency:

  • Band 12 (uplink 699–716 MHz; downlink 729–746 MHz).
  • Band 14 (uplink 788–798 MHz; downlink 758–768 MHz).

It does not boost signal for other cellular networks or frequencies.

Not sure which bands your phone uses? Contact us—our technical support reps will be happy to help you!

FirstNet logo with other carrier logos crossed out The FirstNet logo is a registered trademark of FirstNet, an independent authority within the U.S. Department of Commerce.

FCC notice

The Uniden UM50 FN is classified by the Federal Communications Commission (FCC) as a Part 90 Class B wideband industrial booster. To operate a UM50 FN booster you must obtain the express written consent of AT&T and register the booster with the FCC. Licensing and registration is the responsibility of the booster owner/operator; Powerful Signal cannot license boosters on behalf of its customers. Click here for more information on Part 90 boosters.

Prop 65 notice

Caution triangle icon Warning This product can expose you to chemicals, including nickel, which is known to the State of California to cause cancer, and Bisphenol A, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to link icon.

Product Specifications

Auto/pickup truck/SUV
Outside Antenna:
Omnidirectional magnet-mount
Inside Antenna:
Omnidirectional low-profile
Cable Type:
RG58 / RG174
Connector Type:
50 Ω
+50 dB max
Max Output Power (Uplink):
≥17 dBm
Max Output Power (Downlink):
≥0 dBm
Booster Case Material:
Signal Readout:
LED lights

Warranty Information

For warranty information on this product, please see our Uniden warranty information page.

Questions & Answers