FuzzyMemories.tv provides an old commerical for WVON-AM when there were on a different frequencey with a different format in 1980. Not only can WVON now be found at 1690 AM with a talk radio format, but they can also be found at their new digs at 1000 E. 87th Street. Back in 1980, though there was a mostly music format and you're not likely to find that on AM stations anymore. Also before they moved to 87th Street in the Chatham neighborhood within the past year they could be found on the southwest side on Kedzie.
You can visit WVON on the internet here.