Scott3:

 

Quality of FM transmitters is poor, and the frequencies they operate on are effectively public & very limited, meaning you will run into issues where other nearby people's FM transmitters land on the same frequency as yours. (That is on the assumption that people still use FM transmitters, havn't used one myself for many years.)

 

FM transmitters' default frequency must be the same as National Radio (101.4), since if I'm listening to this channel I start to pick up various transmissions which overwhelm the official station. Quite frustrating if you're stuck in traffic and wanted to listen to the news... They're definitely far more prevalent in South Auckland than the rest of the city.