FM is radio broadcast technology.
FM: frequency modulation. RF: radio frequency
FM is a specific type of RF system
FM/RF systems have a range, 72 to 76 MHz and from 216 to 217 MHz. However, that varies around the world, 2.4 GHz is also used (100m+ range).
![AV booth showing equipment and FM transmitter attached](https://www.hearingloop.org/wp-content/uploads/2024/05/Convention-room-AV-and-FM-system-rb.jpg)