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At its simplest I suppose an antenna can be modeled as an AC voltage source at very high impedance. A volt or two (sufficient to drive ceramic/ crystal/ piezo headphones). However by adding any load to speak of it causes drastic drop in amplitude. (Notice 1 uV is usual sensitivity quoted for commercial receivers.)
To obtain resonant response, create an LC tank or LC series or combination thereof. Make multiple LC arrangements if you desire multiple resonant frequencies.
Attach an AC source through very high ohms. Maybe 10M or 100M or 1 Gohm. Or try white noise, or pink noise, etc.
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