• Radio Modifications:

It is illegal to modify a CB radio to increase its power output (4W MCP for AM/FM or 12W PEP for SSB) or to operate outside the allocated legal CB radio frequencies.

• Antennas Restrictions:

There are no restrictions regarding the antenna height for mobile CB radios. However, for base stations, the CBRS (Citizens Band Radio Service) operator must ensure that the transmitting antenna for the station is not higher than 18.3 meters (60 feet) above the ground, or 6.1 meters (20 feet) higher than the highest point of the building or tree on which it is mounted, whichever is higher. CBRS station antennas must also meet other requirements.

Visit the CFR and FCC Websites for more information.