Free: Contests & Raffles.
Cool man. Let us know how it works. I would probably fry myself if I tried something like that.
I built a wireless e-caller from the plans on Varmint Al's website. Works great out to about 75 yards. I used a set of Nady 151 wireless mics. Mine isn't as good looking as yours though. I used an old tackle box to house mine.
I built elcheapo from varmint als a couple years ago. Yours is way way cooler here's a couple pics