Is This An Ad For An FM Radio To TV Converter?

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


Thanks and thanks for the links