No, CB radios are not illegal. Citizens Band radios are legal to own and operate anywhere in the United States, and you do not need an individual license, exam, or call sign to use one. The FCC authorizes CB use under a “license by rule” system in 47 CFR Part 95, Subpart D, which means anyone can transmit as long as they follow the rules.1eCFR. 47 CFR 95.305 – Authorized Persons The radio itself is legal. What can be illegal is how you use it, what you say on it, and what you do to the equipment.
You Don’t Need a License
Unlike amateur (ham) radio, CB operates under a blanket authorization. You buy an FCC-certified radio and start using it. No paperwork, no fee, no call sign. The FCC also sets no age or citizenship restriction for CB, and the service is open to the public for personal or business communication.2Federal Communications Commission. Citizens Band Radio Service (CBRS)
What Can Make CB Use Illegal
Legal ownership doesn’t mean anything goes on the air. A handful of specific rules govern what you can transmit, and violating them turns a lawful hobby into a federal violation.
Channels, Power, and Timing
CB uses 40 designated channels between 26.965 MHz and 27.405 MHz.3eCFR. 47 CFR 95.963 – CBRS Channel Frequencies Transmitting outside those frequencies (sometimes called “freebanding”) is illegal. Power is capped at 4 watts for AM and FM, and 12 watts peak envelope power for single sideband.4eCFR. 47 CFR 95.967 – CBRS Transmitter Power Limits Conversations are limited to five minutes, with a one-minute wait before you transmit again on the same channel; emergency and traveler-assistance traffic is exempt from the timing limits.5eCFR. 47 CFR 95.957 – Duration of CBRS Transmissions Channel 9 is reserved for emergencies and traveler assistance only, and it cannot be used for casual conversation or radio checks.6eCFR. 47 CFR 95.931 – Permissible CBRS Uses
Prohibited Transmissions
Several types of communication are flatly banned on any CB channel:
- Advertising goods or services, or campaigning for a political candidate on the air (coordinating campaign logistics is allowed).7Federal Communications Commission. 47 CFR 95.933 – Prohibited CBRS Uses
- Music, whistling, sound effects, or any audio meant to entertain or attract attention.7Federal Communications Commission. 47 CFR 95.933 – Prohibited CBRS Uses
- Broadcasting CB communications on radio or TV.
- One-way transmissions, except for emergency calls, hazardous-road warnings, brief radio checks, and voice paging.6eCFR. 47 CFR 95.931 – Permissible CBRS Uses
- Contacting foreign stations, with the sole exception of stations in Canada’s General Radio Service.7Federal Communications Commission. 47 CFR 95.933 – Prohibited CBRS Uses
- Obscene, indecent, or profane language.
- Intentional interference with another station.
Equipment Rules Trip Up Most Operators
The equipment side of the rules is where hobbyists most often cross into illegal territory, sometimes without knowing it.
The Radio Must Be FCC-Certified
Every CB radio used in the U.S. has to be FCC-certified and labeled by the manufacturer.8Federal Communications Commission. Personal Radio Services Manufacturing, importing, selling, or offering non-certified CB equipment is prohibited.9eCFR. 47 CFR 95.391 – Manufacturing, Importation, and Sales of Non-Certified Equipment Radios built for foreign markets, where different frequencies or power levels may be legal, cannot be used on U.S. channels unless they carry a U.S. CB certification. Using a ham radio or any other non-CB transmitter on CB frequencies is also illegal, and the FCC treats it as a violation of Section 301 of the Communications Act, which requires authorization before transmitting on any frequency.10eCFR. 47 CFR Part 95 Subpart D – CB Radio Service
No External Amplifiers, Ever
External RF power amplifiers (often called “linears”) are banned outright on CB. There are no exceptions.11eCFR. 47 CFR 95.939 – External Radio Frequency Power Amplifiers Prohibited The FCC’s approach is aggressive: if an amplifier capable of boosting CB frequencies is found in your possession or on your property, and there’s evidence your station has been transmitting above the legal limit, the FCC will presume you used it. Marketing or selling external RF amplifiers capable of operating between 26 MHz and 28 MHz is prohibited as well.
No Internal Modifications
You cannot modify the internal components of an FCC-certified CB radio.8Federal Communications Commission. Personal Radio Services The typical illegal modifications add frequencies outside the 40 channels or boost power beyond 4 watts. FCC rules require frequency-determining circuitry to be internal and inaccessible from the outside, specifically to prevent this kind of tampering.10eCFR. 47 CFR Part 95 Subpart D – CB Radio Service
Using a CB While Driving
A properly mounted CB radio is legal to use behind the wheel across the country. Federal motor carrier regulations don’t classify two-way radios as mobile phones, so the FMCSA’s handheld-device restrictions on commercial drivers don’t apply to CBs. State distracted-driving laws vary, and a few states have statutes written broadly enough that they could theoretically reach any device, but in practice CB radios have been treated as exempt.
Penalties If You Break the Rules
Enforcement runs from a warning letter to federal criminal prosecution, scaled to the severity of the violation and whether it was intentional.
The FCC can issue warning letters, cease-and-desist orders, and administrative fines without going to court, and it can seize illegal equipment. The dollar amounts are not symbolic. In a 2025 case, the FCC proposed a $25,000 fine against a single CB operator in Illinois who transmitted indecipherable sound effects for long stretches, caused intentional interference, and made unauthorized one-way transmissions.12AR Newsline. FCC Proposes $25,000 Fine Against CB Operator
If a case reaches federal court, a willful and knowing violation of the Communications Act carries a fine of up to $10,000, up to one year in prison, or both. A second conviction raises the maximum prison term to two years. For violations of specific FCC rules rather than the Communications Act itself, a court can impose fines of up to $500 per violation, or $500 per day for ongoing violations.13eCFR. 47 CFR 95.313 – Penalties for Violations of the Communications Act or FCC Rules
Most enforcement stops well short of criminal prosecution. The usual path is a warning, then a proposed forfeiture, then collection. But recent cases show the FCC will escalate against operators who ignore warnings or cause serious interference, and the fine amounts are real.