GMRS vs CB Radio for Convoys (2026)
GMRS is clearer, more powerful and can use repeaters, but in the United States it requires an FCC licence, which is granted on application with no exam. CB requires no licence in the United States and is still what many trail groups run, at the cost of noisy audio and a long antenna. Rules differ in every country, so confirm what your own regulator permits before buying either.
At a glance
| Retevis RA87 GMRS Mobile Radio | Cobra 29 LTD Classic CB Radio | |
|---|---|---|
| Licence in the United States | Required, no exam | Not required |
| Frequency band | UHF | HF, 27 MHz |
| Audio quality | Clear FM | Noisy AM |
| Antenna length | Short | Long for good performance |
| Repeaters | Yes, where they exist | No |
| Common on organised trail runs | Increasingly | Traditionally |
Choose the Retevis RA87 GMRS Mobile Radio if…
You want communication that is actually intelligible. GMRS runs FM on UHF, so transmissions are clear rather than buried in static, higher power is permitted on some channels, and repeaters extend range well beyond line of sight where they exist. The antenna is short enough to live on a roof without catching on branches.
The licence is the condition. In the United States a GMRS licence is issued on application, covers immediate family, and involves no examination, but transmitting without one is a violation. Outside the United States, GMRS as described here does not exist and the equivalent personal radio services have their own channel plans, power limits and licensing. Check with your own regulator before you transmit anywhere.
Check Retevis RA87 GMRS Mobile Radio on Amazon
Choose the Cobra 29 LTD Classic CB Radio if…
The group you travel with runs CB, or you want to transmit with no licence in the United States. CB remains widely used on organised trail runs, radios are cheap and everywhere, and at 27 MHz it will sometimes reach around terrain that blocks UHF.
Accept the compromises. AM audio is noisy, output power is limited by regulation, and a CB antenna needs real length to work properly, which is why a short antenna on a bumper performs so poorly. It also needs tuning to the vehicle with an SWR meter after installation, a step most people skip and then wonder why the range is dreadful.
Check Cobra 29 LTD Classic CB Radio on Amazon
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Comparison based on published manufacturer specifications and the general consensus of owner reports. We have not tested these products side by side. Confirm current specifications and prices before buying. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
Frequently asked questions
Do I need a licence to listen?
Receiving is generally unlicensed, so you can buy a radio and monitor a channel while you decide. Some countries place restrictions on monitoring certain services, so check locally if you plan to listen beyond the personal radio bands.
Which has better range?
In open terrain with good antennas, GMRS on UHF usually gives clearer usable range vehicle to vehicle, and repeaters extend it dramatically. In hilly wooded country the difference narrows, and CB at 27 MHz sometimes bends around obstacles better. Antenna quality and mounting position matter more than the band for a convoy spread over a mile.
Why does my CB have terrible range?
Almost always the antenna. CB wavelengths are long, so a short antenna is a heavy compromise, and the installation needs a good ground plane and to be tuned with an SWR meter after fitting. An untuned CB antenna wastes most of the transmitted power and can damage the radio.
Can I use an amateur radio instead?
Only if you hold an amateur licence, which in most countries requires passing an examination, and only on amateur frequencies. Amateur equipment is capable and cheap, which tempts people to transmit outside what they are licensed for, and that is a violation regardless of what the radio can do. Everyone in the convoy would need a licence too.
How we choose: we compare published manufacturer specifications, standards documents including ABYC E-11, and verified owner reviews. We do not test gear in person. Vehicle payload, roof load and charging limits vary by model and year, so confirm yours against the door jamb sticker and the owner's manual rather than any number published here.
Totalling your own build weight against your payload? The Overland Build & Power Planner is the paid version of these pages: 8 printable worksheets you fill in with your own numbers, plus the full PDF, $29.