A system and method of determining an available frequency sub-band for radio traffic in a multiple node radio network is disclosed. The method and system provide for communication over a radio frequency band, the radio frequency band comprising radio frequency sub-bands and providing a radio node group of at least one radio communications devices configured to broadcast and receive on the radio frequency band. The system and method create a time for a window of radio broadcast silence on at least one of the radio frequency sub-bands by the radio node group. The system and method survey the at least one of the radio frequency sub-bands during the window of radio broadcast silence. The system and method choose, based on the survey, a radio frequency sub-band for broadcast from the radio frequency band.
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