CB Radios are sometimes utilised for short distance communications on public AM frequencies. Handy for proximity communications between two to ten kilometers. CB Radios operating on AM frequencies have been around for many years and are well liked by lorry drivers who love keeping in contact with their fellow drivers. CB Radios that are on AM frequencies is an ideal way to communicate since it is cheaper. The 26MHz frequency is free to be used in and the CB sets are priced at between $99 and $500. CB Radios operating on 26MHz in are hard-wired into a vehicle or base station. They're always attached to a power supply and are always ready to be used.