What's a quick, easy and inexpensive way to boost the am/fm signal to my home radio?

Say I live in a valley, and getting any kind of antenna above the rim is not realistic.

I remember you used to be able to buy devices that would ‘turn your whole house into an antenna’ when plugged into your home wiring. Was that a scam?

I have old but modern (2000) rabbit ears for a TV. Will they work on the radio? It’s an under-the-counter radio, so I can’t tell if any of the connections match.