CB, FRS, GMRS, MURS: what's actually the difference?
Four different two-way radio "services," overlapping rules, and a wall of forum arguments - no wonder it's confusing. Here's the whole landscape on one page, in plain English: what each one is, why two of them share channels, what on earth MURS is, and how to pick without reading a spec sheet.
The four, side by side
| CB | FRS | MURS | GMRS | |
|---|---|---|---|---|
| License? | No | No | No | Yes - $35, no test |
| Band | HF, 27 MHz | UHF, 462 MHz | VHF, 151 MHz | UHF, 462 MHz |
| Channels | 40 | 22 | 5 | 22 + 8 repeater |
| Max power | 4 W (12 W SSB) | 2 W | 2 W | up to 50 W |
| External antenna? | Yes | No | Yes | Yes |
| Repeaters? | No | No | No | Yes |
| In a phrase | Legacy trucker radio | Bubble-pack family walkie | The quiet wildcard | The serious upgrade |
What each one actually is
CB (Citizens Band) - the original people's radio, and the one your parents know. Forty channels down at 27 MHz, no license since 1983, 4 watts. Because it sits on a low (HF) frequency, a CB signal can occasionally skip off the ionosphere and be heard hundreds of miles away - and be drowned in noise from two blocks over the next minute. Still alive on the highway and among off-roaders, but for household use it's mostly a nostalgia band now: big antennas, unpredictable range.
FRS (Family Radio Service) - the license-free bubble-pack walkie-talkie. Twenty-two shared UHF channels, 2 watts, a fixed antenna you can't upgrade. It's the default "here, take this and stay in touch" radio, and for a household spread across a neighborhood it genuinely works. Ignore the "35 miles" on the box; the real number is more like a half-mile to two miles.
MURS (Multi-Use Radio Service) - the one nobody's heard of. Five channels at VHF 151 MHz, license-free, 2 watts - but unlike FRS, you're allowed a real external antenna. Because it's VHF and lightly used, MURS often reaches farther over open ground than FRS and stays uncrowded. It's the quiet wildcard: farms, big properties, small businesses, and people who specifically want a channel nobody else is on. The catch is a thin gear ecosystem - fewer radios to choose from.
GMRS (General Mobile Radio Service) - the grown-up version of FRS. Same UHF channels, but you're allowed up to 50 watts, external and rooftop antennas, and repeaters - community-run towers that relay your signal across a whole county. The price of admission is a license: $35, no exam, and it covers your entire immediate family for ten years. It's the best value in radio for a family that wants real range without becoming hobbyists.
Why it's so confusing
Two things trip everyone up.
FRS and GMRS share the same channels. A $30 bubble-pack FRS radio and a $200 GMRS mobile can talk to each other on the overlapping channels. So the line between "no license needed" and "license needed" isn't a different radio or a different band - it's just how much power and what antenna you're allowed to use on the same frequencies. That's why nobody can keep them straight.
The band matters more than the watts. People fixate on power, but the frequency decides where a radio shines:
- UHF (FRS, GMRS) threads through buildings and suburbs well - good where there are walls and houses.
- VHF (MURS) carries farther over open, flat, or wooded ground - good on a farm, worse inside.
- HF (CB) can bounce off the ionosphere for freak long-distance contacts, but is noisy and unreliable up close.
More watts help, but you can't out-power a bad band choice for your terrain. (The full physics of "how far will it really reach" is here.)
So which do I get?
The honest ladder:
- FRS - free, simple, fine for a household in a neighborhood. Start here.
- GMRS - when you want real range and repeaters. The $35 no-test license is the single best upgrade in this whole list.
- MURS - only if you specifically want a quiet VHF channel over open ground and don't mind the thin gear selection.
- CB - mostly legacy; skip it unless you're already in a CB crowd (off-road group, trucking).
That's the landscape. When you're ready to actually choose and buy for your household - realistic ranges, real costs, and the Baofeng warning - the family radio decision guide walks it through. And past all four of these sits amateur (ham) radio: a real license and a real skill, the layer that keeps working when everything else is down.