Hi Avanturis,
The coil antenna or (better) the stylus antenna must be connected to 3 turns coil.
It is correct (-) polarization of the battery to connect to mass GROUND.
All measurements can be performed in the laboratory in the absence of metal buried. The two terminals of the coil antenna must be connected together and only one wire goes to the 3 turns coil, but, I repeat, it's better the stylus antenna.
Regards
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