Build a 18" square frame, a picture frame that has each side = to 18" would work perfect. Wrap 14 turns of thin insulated copper wire around it (buy 100'of #22 insulated wire. Also you need to buy a crystal radio kit that runs for $8. Wrap 14 turns of the wire around the frame, spacing it out evenly, and conect the ends of the wire to the leads of the capacitor that comes with the radio kit tape the capacitor to the wood frame
Done!
Place the radio in or near the loop and tune to a station.
tune the capacitor in for best results.
