WMAQ was an AM radio station in located in Chicago, Illinois, USA & broadcast @ 670 kHz with 50,000 watts. The station was in existence from 1922 to 2000 & was the oldest surviving broadcast outlet in Chicago. It was a class A clear channel station & could be heard, particularly @ night, over most of the eastern US. WMAQ was a charter affiliate for the CBS Radio Network, but was longest known as a NBC Radio O&O station. It's transmitter was located in Bloomingdale, Illinois just off of Army Trail Road, where it remains to this day. The AM 670 transmitter is now in use by WMAQ's successor, All-Sports Radio WSCR.