WXMX was allowed to stay on the air at full power only because there were located further down. The station had a regular transmitter putting out (Don't quote me on this) around 3KW. It was also hooked into the community diplexer at that time. The station did have to lower it's power to half or less in order for the tower crew to work on the tower after the accident.
If I remember right, 98.9 was around 800 watts until 1997 when Jacor lowered it even more to bump it up to its current 2600 watts at 581 feet.
in the records i found, 98.9 started out in 1990 at 3000w at 121m above ground, then in late 1993 moved to the top of the tower (255m) with 580w, it was 2 years later in 96 that they dropped back down to 177m with the current 2600w