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Originally Posted by Esteban
This is possible since this experiment: you tune near a station in FM band and positioned the small spiral coils (see drawn), move only one of them and leave the other fix. You will note that improve the reception. So detune a little the tandem. Buried metals tend to complete the tunning, so can be useful another kind of emission, but to depend of radio station is very problematic.
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What do you mean by
small spiral coils?
Are these air-cored, wound on ferrite, flat .... or what?