The tune frequency, L1, C10 and base/emitter of TR2, it's in the 150 - 200 Mhz range.
The 8 Mhz signal is the carrier that is modulated indirectly by the "phenomenon", without this carrier I think there would be nothing to be amplified.
I do not know if in your country my LRL works with these values. First of all you must have a field where do the tests with a metal (copper, silver, gold) buried for 2 or 3 months. If the LRL not work changes the value of L1 (one turn or two turns or more) or changing C10. The capacitance of the joint base / emitter of TR2 is about 10pF and my LRL works well without C10 only with the capacitance of the base / emitter of TR2.
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