As Northy said, you'll need to find out exactly what they want recorded, to what standard, over what period and you'll probably need ambient recordings without the RC action as a comparison.
I work with a company who do this professionally for stadiums and arenas, I may be able to persuade them to help out on the cheap so drop me a note if you need....
Mart
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RB5 - LRP - Spektrum - Atomic Carbon
ZX5-SP Ion - Tekin - Novak - Spektrum - Atomic Carbon
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