I was looking through the ads in an old Vane A Jones book from 1958 that lists radio and TV stations in North American.
Anyway I came across this ad
(note: the image is 1000 X 1571 so it may be slow to load on some connections)
It looks like it’s advertising a product to be able to receive FM radio on your TV set.
I’m not 100% sure though. Can someone tell me definately if this is what it does?
I would think you could just go out and buy an FM radio, but this is from 1958 before FM took off so perhaps this would be cheaper