Seriously though, at what frequencies are the EVP's? I run a spectrum analyzer, a shielded room, and antenae's with amplifiers which detect from 1HZ all the way up to a few GHZ. I have not found any voices yet. Lot's of chatter from blenders, coffee grinders, triac switching devices, vacum cleaners, etc.....but nothing yet from dead folks. That is unless all the other stuff is drowning them out?
I think you're just missing some tin-foil. That should clear your reception.