I will post about practical coil design after return to my home, I am in another town at this moment.
In cases of reflective waves we do not need target to be resonance with TX or RX frequency.
For Scalar waves detecting, similar targets (similar coins, similar rings etc.) radiate at similar resonances. Here we need Scalar wave sources as trigger to put targets in higher amplitude of resonance and then relatively narrow-band receiver with enough directive Scalar antenna to catch at target resonance.
I don't know, particularly for coins or rings what could be its scalar resonance. This should be determinated experimentally. So step by step.
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