27 MHz

27 MHz refers to a frequency in the radio spectrum commonly used for short-range communication. It is well known for its use in Citizens Band (CB) radio, a service that allows individuals to communicate without a license over distances typically spanning a few kilometers. The 27 MHz frequency is also utilized in various remote-control devices, model aircraft, and some commercial uses. Overall, it represents a part of the electromagnetic spectrum that enables various forms of wireless communication, making it integral to hobbyists and certain industries.