I use five FM and one AM transmitters around the ranch. So far EDM transmitters deliver the most bang for the buck. The sound quality is excellent and quality of construction better than others in the price range. You may pay a bit more for the EDM's, but it is well worth the price and they stand behind their products.
I know you are asking why five FM's; I'm in an area with little radio service. The only FM's, on the dial are mine! Otherwise the FM dial is dead, except for a Spanish station.
I use a dual & single Dish Network receiver to supply News, Oldies & Country. I have a KU band that supplies a Talk network, and a scanner provides weather 24/7 to the AM transmitter. Computers provide programming to the last transmitter, like Old Time radio in the evenings and other music.
The set up allows anyone, to listen to anything they want; anywhere on the ranch they want. It also helps to keep the radio clean for the little ones; this is a Rap free zone!
Steve
http://www.radiobrandy.net