This is the FM Antenna Section of
The Broadcast Archive
Barry Mishkind - The Eclectic Engineer
An FM antenna has a wavelength of only about 3 feet or so, so the antenna has
to be placed on the top of a tower.
Sometimes an FM station is added to the top of an AM tower. There are issues
related to isolation.
Sometimes several FM stations are on the same tower. They can be adjacent,
interleaved, or combined into one antenna. Each has certain advantages.