Yes JP, your scientific observations confirms my thoughts.
I had the idea of a major improvement: Including special metal samples into the box like in the photo below...
You get outstanding results if the spheres are allowed to touch the copper side of the PCB. Of course in that case there is the possibility of the signal being so strong, that some transistor may burn, as it happened once in an incredible situation with the amazing Dr Hung, the target was a treasure so big and deep it was never found.
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