Interesting survey.

WXRT-FM 93.1 picked up the traction they lost from the last two surveys.
WBBM-AM 780 is back on top.
WKSC-FM 103.5 is still ahead of WBBM-FM. No surprise.
WLIT-FM 93.9 is holding on until the cash register explodes from all of the Christmas advertising.
WDRV-FM 97.1 Too many cooks in the kitchen. The music is flawed.
WCHI-FM 95.5 iHeartMedia, blow up this format and place something worth listening to on the 95.5 frequency. Problem is the demos. 87.7 would love the frequency. The listeners of 70 and up would follow due to the oldies music. Advertisers ignore this demographic. It's all about billing.
WSCR-FM 104.3 The Score is on a mega-signal. What's going on over there?
WTMX-FM 101.9 I'm betting some of the female listeners dumped the Drive 97.1 and are now listening to the Mix.

We don't see WLS-AM or WLS-FM due to the legal issues with Cumulus.