Anyway, I'd be happy to answer radio questions... but don't overlook the use of cellphones. The Verizon "In" plan is an attractive way to do it cheap.
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Yeah, the phone company puts up the repeater network. :-) I figure it would take be about a kilo buck to put together a portable UHF or VHF or UHF/VHF crossover repeater that I could drop on the ground, chain to a tree, and stab a 'tenna stake in the ground, and be on the air. From what I've heard, if you want to talk from the pits all the way around Road Atlanta, you pretty much have to have a repeater on the hill. Haven't tested it myself, tho.