way radios used in various scenes show all of the crew  communicating, even though the antennas shown on the radios are  using different bands. Some radios have an antenna used with the  400mhz band and others with the 800mhz band. The 800mhz band is  almost exclusively used with repeaters and require the radio to be  within a few miles of a tower. Although 800mhz radios can be used  "radio to radio" they are very expensive and would be useless on the  open seas.