Hi All
Perhaps this instruments already exist, the Esteban' pistol or Andreas' locator, for example! They have in common a coil that it generates a transmitter magnetic field and a receiver coil that it senses some modification 1 or 2 meters near the instrument. I think that the crucial point it's an interaction between the electric field above the ground and the artficial magnetic field. As Esteban says no alien technology but old VLF metal detector technique it's sufficient for our purpose!
Tomorrow I go in ferie in Switzerland for 2 weeks and without internet possibility...
Best wishes
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