I wonder whats the Strenght of the Copper Precession Signal at.. lets say natural Earth Magnetic Field and 1m distance ?
I cant imagine this could be detected, with all that Noise around.

If we had a real Signal here, all Metals would cause Interference to all kinds of sensitive Electronics.
__________________
"Sag deinem Hauptmann: Vor Ihro Kaiserliche Majestät hab ich, wie immer, schuldigen Respekt.
Er aber, sag's ihm, er kann mich im Arsche lecken!“