CB Radio Regulations: Licensing, Power Limits, and Penalties

CB radio regulations sit in Part 95 of the FCC’s rules, and they cover far more than most operators expect from a service that requires no license. You can key up a compliant radio in the United States or its territories without any application, exam, or fee, but you have to stay inside federal limits on equipment, power, antenna height, channel use, and on-air conduct. Break those rules and fines can reach $24,496 per violation per day, with equipment seizure available in the worst cases.1GovInfo. 47 CFR 1.80 – Forfeiture Proceedings

Do You Need a License to Operate

No. CB uses a “license by rule” system under 47 CFR Part 95, which means you are automatically authorized to transmit the moment you turn on a compliant radio.2eCFR. 47 CFR Part 95 Subpart D – CB Radio Service There is no age minimum and no test. The only people barred from operating are representatives of foreign governments.3Federal Register. Personal Radio Service Reform

The catch worth understanding: your authorization is voided the instant you violate any operating rule. You don’t get a warning letter before losing your right to transmit, and contesting a fine doesn’t keep you legal in the meantime. The violation itself revokes your standing to be on the air.2eCFR. 47 CFR Part 95 Subpart D – CB Radio Service

Equipment That’s Legal to Use

Every CB transmitter sold or used in the United States must be FCC-certified, meaning the manufacturer submitted the model for testing and the FCC confirmed it meets the technical rules before it hit the market.4eCFR. 47 CFR 95.961 – CBRS Transmitter Certification You cannot legally build your own transmitter or import an uncertified radio from overseas and put it on the air.

The certification also locks the radio down after it leaves the factory. Frequency-determining circuitry, including crystals and programming controls, must be sealed inside the housing with no external access.2eCFR. 47 CFR Part 95 Subpart D – CB Radio Service Swapping the microphone, speaker, or antenna is fine. Opening the case to modify the circuitry is not, because even small internal changes can push the radio outside its certified parameters and cause interference on neighboring frequencies.

Power Limits

CB rules set a hard ceiling for each transmission mode:5eCFR. 47 CFR 95.967 – CBRS Transmitter Power Limits

  • AM: 4 watts mean carrier power.
  • FM: 4 watts mean carrier power. FM was added to the CB rules in 2021 and produces cleaner audio than AM, though fewer radios currently support it.6Federal Communications Commission. Petitions for Reconsideration – Personal Radio Services Reform
  • SSB: 12 watts peak envelope power. SSB strips out the carrier signal to concentrate energy in the voice signal, giving it roughly three times the effective range of AM at a given power level.

FM transmissions must also stay within a peak frequency deviation of ±2 kHz, and the authorized bandwidth for both AM and FM signals is 8 kHz.6Federal Communications Commission. Petitions for Reconsideration – Personal Radio Services Reform

No External Amplifiers

External RF power amplifiers, often called linear amps, are flatly prohibited for CB. No exceptions, no workarounds. If an FCC field agent finds an amplifier at your station along with evidence that your signal has exceeded legal power, the agency presumes you used it, and the burden shifts to you to prove otherwise.2eCFR. 47 CFR Part 95 Subpart D – CB Radio Service

The ban goes beyond operation. No one may manufacture, import, sell, or offer for sale any external amplifier capable of operating below 144 MHz that is intended for CB use.2eCFR. 47 CFR Part 95 Subpart D – CB Radio Service The FCC enforces this rule aggressively because a single overpowered station can wipe out communications across an entire area.

How High Your Antenna Can Go

Antenna height is capped at one of two measurements, whichever is higher:7eCFR. 47 CFR 95.941 – CBRS Antenna Height Limits

  • On a building or tree, the highest point of the antenna cannot exceed 20 feet above the structure.
  • On a ground-mounted mast, the total height cannot exceed 60 feet above ground level.

The “whichever is higher” language does real work. If your house has a 50-foot roofline, you can mount an antenna 20 feet above that roof for a total of 70 feet above ground, because the building-mount limit beats the 60-foot ground-mount cap. On a single-story home, the 60-foot ground-mount rule is likely the more generous option.

Separate restrictions apply near airports. If your antenna sits close to a military or public-use airport, its highest point generally cannot exceed one meter above airport elevation for every hundred meters of distance from the nearest runway.8eCFR. 47 CFR 95.317 – Registration of Antenna Structures

Channels and Emergency Priority

CB uses 40 shared channels running from 26.965 MHz on Channel 1 to 27.405 MHz on Channel 40.9eCFR. 47 CFR 95.963 – CBRS Channel Frequencies No operator owns or has priority on any frequency except in an emergency. Two channels stand out:

  • Channel 9 (27.065 MHz) is legally reserved for emergency communications and traveler assistance. No other use is permitted, and if a distress call comes through on Channel 9, you have to yield the frequency.10eCFR. 47 CFR 95.931 – Permissible CBRS Uses
  • Channel 19 (27.185 MHz) has no legal restriction, but by long-standing convention it is the primary channel for truckers and highway travelers sharing road and traffic conditions.

Emergency priority isn’t limited to Channel 9. On every channel, operators must give way when someone signals an emergency involving immediate danger to life or property.10eCFR. 47 CFR 95.931 – Permissible CBRS Uses

What You Can’t Say or Do on the Air

Federal rules regulate the content of CB transmissions. Prohibited uses include:11eCFR. 47 CFR 95.933 – Prohibited CBRS Uses

  • Advertising or soliciting for products, services, or businesses.
  • Political campaign broadcasts to voters. Coordinating campaign logistics is fine; broadcasting campaign messages is not.
  • Music, sound effects, or whistling for entertainment.
  • Obscene or profane language, which also falls under broader FCC decency rules.
  • International communications, with a single exception for Canadian General Radio Service stations.
  • One-way broadcasts such as announcements or monologues. Calling out to start a conversation does not count.

There’s also a time limit. A single conversation cannot run longer than five continuous minutes, and once you hit that mark you have to stay off the channel for at least one full minute before transmitting again.2eCFR. 47 CFR Part 95 Subpart D – CB Radio Service The rule exists to keep any single operator from monopolizing a shared channel.

Connecting a CB radio to the public telephone network is allowed but tightly conditioned. You have to make the connection manually, remain in control of the station the whole time, monitor every part of the conversation, and cut the transmission immediately if any rule violation occurs.12eCFR. 47 CFR 95.949 – CBRS Network Connection Direct-wired interface devices must also comply with Part 68 telephone connection rules.

Penalties for Violations

The FCC’s Enforcement Bureau handles CB violations through a process that escalates in stages. Most cases begin with an interference complaint or a tip that leads to a field measurement or a Letter of Inquiry demanding information about your station.13Federal Communications Commission. Enforcement Overview

Because CB operators don’t hold individual licenses, the first formal contact is usually a citation. A citation puts you on notice that your activity violates federal rules and warns that continued violations will bring fines.13Federal Communications Commission. Enforcement Overview Fix the problem and the matter usually ends there.

When violations continue or are serious enough to skip the citation stage, the FCC issues a Notice of Apparent Liability proposing a specific dollar amount. After the 2024 inflation adjustment, the maximum fine is $24,496 per violation or per day of a continuing violation, capped at $183,718 for any single act or pattern of conduct.1GovInfo. 47 CFR 1.80 – Forfeiture Proceedings Running an illegal amplifier for weeks, for example, can generate daily penalties that stack fast. You can pay, contest the proposed amount in writing, or ignore it. Ignoring the notice leads to a Forfeiture Order, and unpaid debts get referred to the Department of Justice for collection.13Federal Communications Commission. Enforcement Overview

In the worst cases, particularly where someone willfully and knowingly operates an unauthorized or modified transmitter, the FCC can authorize physical seizure of the radio equipment. Seizure is an in rem action against the equipment itself and typically involves coordination with federal law enforcement.13Federal Communications Commission. Enforcement Overview It’s uncommon for routine CB violations, but operators running high-power illegal setups that cause persistent interference are the usual targets.