Back in the 60s I made a radio that was powered by the local long wave transmitter.
Also there was a man who lived close to a very long wave radio mast. He filled the loft with a criss cross of wires and used the energy to charge 12V batteries. Unfortunately the mast was used to communicate with nuclear submarines, and it put a dent in the radiation pattern, making it impossible to communicate with them. Even more unfortunately this null was in the direction of Moscow and it was thought to be some sort of Soviet jamming device. When he was tracked down he got three years in prison for illegal use of electricity.