I also recommend a decent IEM system as your best solution. Sennheiser are a solid option and probably the best value, but with any wireless system, if you shop the used market, make sure you get one that operates in a legal frequency range. There are thousands of used systems floating around that are on illegal bands(due to the FCC selling off the 600MHz band to cell companies). Anything brand new will be legal. The disadvantage of the illegal frequencies are 1-if you are near a big city(like Atlanta), you may have trouble finding a workable channel. And 2-if the FCC catches you(maybe not a big worry...), its a $10k fine
If you are "out in the country", then none of this may matter for you but its something to be aware of
