FRS and the higher powered GMRS operate in the 450 MHz range with analog FM.
Only individuals can obtain GMRS licenses, not associations or commercial
users. The range is strictly line of sight and can be shortened by tees
which absorb the signals.
Check with your public safety agency to see what systems they use. You want
to be able to talk back to the search base and to others in the field. We
used to call this communicating, now it is called interoperability.
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