:lol: *lol*
All 3 members need to set 3 different frequencies so that they won't pickup up one another's signals. Most of the wireless systems have their default frequency range (I think) and as long as all 3 of you program different frequencies, you're good to go. Of course, also have to see the venue's wireless usage...as long as they don't interefere with their wireless mics, etc (or nearby taxi uncle's radio :lol: ), it should be fine. Usually, you'll know when you do soundcheck...if the sound coming out is garbled/pick up other radio sounds, etc, then just change the channel on the wireless system until you get a clear signal (actually it never happened to me before though).
Reason why UHF is preferred is because it's less cluttered and less appliances uses it compared to VHF.