WKRK Radio 92.3 in Cleveland went from high 1's to mid 4's in cume after switching to alternative.
You are citing AQH share, not cume.
Radio 92-3 is doing VERY well. They have pulled ahead of WMMS in the ratings. Very different sounding station, though, than Q101 with somewhat different demo targets. Either approach, though, would be a VAST improvement over the current sound of RXP.