Why would they be broadcasting anything near GPS frequency?
Probably not deliberately, could be a harmonic of some clock used in equipment leaking out due to damaged shielding or missing covers.
In the pre HDTV days one common clock in broadcast equipment was 13.5 Mhz. The ninth harmonic of that is 121.5 Mhz.
There was more than one reported incident of TV stations getting a call asking if there was a downed aircraft in their parking lot.
Both sides of the call usually were well aware of the actual probable source.