This reminds me enormously of the simplest electronics project I ever put together: A Crystal Radio back in the '70s. If you're not familiar with them, they're

This reminds me enormously of the simplest electronics project I ever put together: A Crystal Radio back in the '70s. If you're not familiar with them, they're not much more than a coil and a "cat's-whisker" (diode) and they are powered by the radio-waves themselves.