From this morning's Tom Taylor column...
Chicago – Lousy weather and a solid news image keep CBS Radio’s all-news WBBM (780 AM and 105.9 FM) at the top with its largest PPM ever, 5.7-7.2-7.4. Second is iHeart urban AC “V103” WVAZ (6.7-6.2-6.3) and third is Hubbard’s hot AC “Mix” WTMX (4.1-5.2-5.2). The next grouping starts a full share down at 4.2, with iHeart CHR “Kiss” WKSC (3.8-4.0-4.2). Fifth is hot AC/former all-Christmas sister WLIT (14.2-4.5-4.1). Cumulus classic hits WLS-FM shakes off a Blue Christmas and improves with at-work listening (2.6-3.3-3.7). Tribune talker WGN endures another fluctuation as it adjusts personalities in middays and PM drive (2.8-3.5-3.1). Chicago Public Media’s news/talk non-com WBEZ finds new energy with its best topline since December 2008, 1.5-2.3-2.6. But it’s status quo for Cumulus talker WLS (1.2-1.1-1.2). The country story is CBS Radio’s incumbent “US 99.5” WUSN (2.6-3.3-2.8), iHeart’s upstart “Big” WEBG (1.6-1.0-1.7) and Digity’s suburban WCCQ (0.5-0.6-0.5). CHR Kiss owns the cume crown at 2,340,400.
An even more in-depth analysis is here at Chicagoland Radio and Media. According to this, WGN has fallen out of the top ten completely.