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Anyway if you use Passive Receiver alone,but with good sensitivity(50+50 turns 0,20mm with 12 or 15 cm diameter coil) its possible to find precious metal,medium or big size,thats what i know from Alonso the LRL inventor
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Yes, I did this test before , but with my modified at passive receiver circuit
Detect spark more than 1 meter .
didn't test at historical places yet .
Best regards.