Just about any of the Family Radio Service or GMR radios will work. I saw some GMRs radios today for under $90 that were advertised for 18 miles. Pick them up at any WallyWorld. Even the cheep/cheap ones are good for about a mile, which is all you really need if you are convoying. Some radios require an FCC license. I have some Motorola T5500's. I even bought the FCC license to operate them on the upper channels, but I doubt anyone would know if I hadn't.
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