Here is another aircheck of a long-lost 1980s top 40 station in the Rockford, IL market. According to Wikipedia, 104.9 WYBR had a top 40 format from 1983 until 1986. I think this was taped in the overnight shift. I recall that WXXQ and WZOK, the other Rockford-area top 40s came in much better than WYBR in the Madison area where this was taped.
http://www.youtube.com/watch?v=zZKEY-oIXk4
http://www.facebook.com/pages/Mostly-Upper-Midwest-Airchecks/115143288522852
http://www.youtube.com/watch?v=zZKEY-oIXk4
http://www.facebook.com/pages/Mostly-Upper-Midwest-Airchecks/115143288522852