this is a good tread, but dont forget the basics, first there was a crystal radio, then later a anteena coupler. The german diode which breaks down.
The anteena coupler was the most important of all. also, there was a tunable receiving coil on the coupler, those basics almost always get overlooked. I should point out, the coupler on the anteena connected between anteena and earth ground is isolated from the rest of the circuit.