Help with a Foxhole radio Today we finished a crystal radio. Problem is it doesn't work here is a picture of it. Can anyone see where any mistakes are? I used copper wire from an old TV set the diode is a piece of graphite from a #2 pencil and an old razor blade the ground wire and the antenna are multi strand electric wire. The speaker is from another radio kit. I soldered the coil wire to the ground wire then to the razor blade. wanted my son to have the experience of making a radio.