Hi Ivconic
you have to detect no metal but the "alo" near a buried metal, I think that this is an electric phenomenon and then Zahori can detect it. But as Esteban says it's better to use also an alternate magnetic field that acts as an antenna. With my modified Zahori I have obtained some beeps in a spot but without a confirmation after few minutes, as the phenomenon it was disappeared.
Best Regards
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