Hello FrancoItaly
Your LRLs work but suffer from so called "Albedo problem". What is it ?
When you enter in range of Halo-effect field with telesopic antenna you have already disturbed the field. Your antenna need extreme loosy coupling with ambient, to be at maximum sensitivityy not disturbing the field. Use capacitive coupling between two very small capacitors or two very small inductors at the end of your antenna. Also good high impendance RC filter is needed to reject iron targets or selective LC filters, each tuned for specific color metal.
Best Regards
Dubulumach.
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