Wikipedia
WKSC-FM
WKSC-FM (103.5 FM) – branded as 103.5 KISS FM –is a Top 40 (CHR) radio station serving the Chicago area. They are owned by iHeartMedia (formerly Clear Channel Communications until September 2014). The station is known as "103-5 KISS FM" or simply "103-5". WKSC's main competition is WBBM-FM.
WKSC has studios located at the Illinois Center complex on Michigan Avenue in Downtown Chicago, and it broadcasts from a 4.3 kw transmitter atop Willis Tower (the former Sears Tower).
As of November 2013, WKSC-FM is the most popular radio station in Chicago with an average of 2.4 million listeners.