Here is the circuit I built to try and listen to SW at 3.5-4 MHZ. I used a 100 uH coil and 19pf resistor to pull in a station... I got AM1340????? I used a long piece of wire (15') out the window, and since I don't have my adjustable air cap yet, I just stuck a few small caps in parallel... Any thoughts?
http://www.circuitdiagram.org/crystal-radio-with-amplifier.html
http://www.circuitdiagram.org/crystal-radio-with-amplifier.html