Hello there, Just like sargehendricks I'm quite new to this stuff. (cannot elaborate on the purpose of constructing the gadget either...) I created this device from scratch, simply bought the components, blank circuit board and not to forget soldering iron from the local store. It now seems to work, so I'm quite proud... 8) Question: I tried it before puting it in the metal box. Adjusted the pot-meter so that the sound was barely there. As soon as I start to move the antenna the sound goes crazy. Is this because it's not in the metal case or does this mean my entire appartment is bugged ;D? I tried to 'detect' the signal from my cell-phone, but when I move the phone (while calling some number) towards the antenna, the sound from the speaker becomes less... ??? Can anyone help me out??