This assumes that communication is achieved through walkie-talkies, which have wide/narrow band settings, and that the primary interference mode is caused by excessive bandwidth.
Therefore, a potential solution is to switch to narrowband mode. Before FM modulation, some filtering might be applied to the audio spectrum, but this would reduce the bandwidth used by FM, which in turn helps to minimize interference from adjacent channels.
Furthermore, with a narrower FM spectrum, the energy becomes more concentrated, which helps to transmit signals over longer distances.
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