I've never heard of it, but as the other reply mentions, it's possible. If you are near an AM station, you can make a radio with just a earphone(now called ear

I've never heard of it, but as the other reply mentions, it's possible. If you are near an AM station, you can make a radio with just a earphone(now called ear bud?), a diode, and a piece of wire. You will pick up all nearby stations, but one will likely be stronger/closer than the rest, so you would hear that one. A slight improvement of that is the 'crystal radio' that adds the ability to tune to a certain station. [1] It is common for people living near AM stations to hear the radio signal induced into their house/business wiring. It's a common problem with landline telephones near these stations, you can hear the radio in the phone while you're trying to use it. Intercom systems are also vulnerable. You've probably also heard this from time to time when someone with an illegal CB amplifier uses their radio near a business with an intercom system. It will typically briefly bleed into the intercom system, with everyone looking around trying to figure out where that noise came from. This may be common only in the south, I'm not sure how prolific CB radios are throughout the country. [1] https://en.wikipedia.org/wiki/Crystal_radio https://en.wikipedia.org/wiki/Crystal_radio