The frequency was shifted in 1988 by directive of the FCC , to alleviate interference for nearby frequencies used for aerial navigation .
The frequency was to allow for a new full - power station to be built on 99.5 in the Salt Lake market .
The frequency was shifted in 1988 by directive of the FCC , to alleviate interference for nearby frequencies used for aerial navigation , and to allow for a new full - power station to be built on 99.5 in the Salt Lake market .