 Afterwards, The Fox tweaked its format back to mainstream CHR, and at the same time, added some hip hop to compete with Power 96 (Z95.5 had left the CHR format by then to flip to an Adult Top 40 direction).Ratings did improve and the station posted frequent Arbitron top 10 showings in the late 1980s and early 1990s - but advertising revenue was poor and, in September 1990, the station went into receivership.In addition, WDFX's ratings were adversely affected (as were WHYT's) by the debut of modern rock station 89X in 1991.