CB radio uses the same frequencies for sending and receiving on each channel, which is why two people cannot talk to each other at the same time (see half-duplex).

Check out these CB Radios only on truckinweb.com, the official website of Truckin' Magazine. ... Essentially, while using side band you do not broadcast a carrier frequency.

That is why we require a Citizens Band radio (CB) on the Ultimate Adventure. Having a CB is but the first step in communicating on the trail though, not the last.

CB radio can trace its roots back to 1958 when the Federal Communication Commission (FCC) established the Citizens Radio Service, but it didn't really take off until the 1970s.