Eligibility
There are no age, citizenship, or license requirements to operate a CB radio in the United States. Operators may use any of the authorized 40 CB channels; however, channel 9 is used only for emergency communications or for traveler assistance. Use of all channels is on a shared basis. However, foreign governments and their representatives are not eligible to use citizens' band radio within the United States.
Operation is permitted anywhere within the United States and its territories or possessions; as well as anywhere in the world except within the territorial limits of areas where radio services are regulated by a foreign government, or another U.S. agency such as the Department of Defense.
Transmitters must be FCC certified and may not be modified, including modifications to increase output power or to transmit on unauthorized frequencies. Output power is limited to 4 watts for AM transmitters and 12 watts peak envelope power for single sideband (SSB) transmitters. The antenna may not be more than 20 feet (6.1 m) above the highest point of the structure it is mounted to, nor more than 60 feet (18.3 m) above the ground.
Read more about this topic: CB Usage In The United States