Radio waves travel across the crystal radio antenna all the time.
Radio waves make radio wave electricity flow between the antenna wire and the ground wire .
This electricity is connected to the crystal radio. The crystal radio uses a tuner to tune the electricity to receive just one station. Then it uses a detector to convert this radio wave electricity back to sound electricity. It uses an earphone to convert the sound electricity to sound you can hear. Crystal Radio A crystal radio is the simplest kind of radio.