WLUP-FM (97.9 FM, "The Loop") is a commercial classic rock radio station serving the Chicago metropolitan area. Owned and operated by Merlin Media, LLC, WLUP transmits its signal from an antenna located the top of the Willis Tower in Downtown Chicago at a height of 1,390 feet (420 m) with an effective radiated power of 4,000 watts. WLUP can be heard as far away as Kalamazoo, Michigan, which is 90 miles (140 km) from Chicago. WLUP also airs HD Radio programming on two subchannels: 97.9-HD2 airs a comedy format called "Loop Laffs", while 97.9-HD3 airs a locally produced Smooth Jazz/Soft AC hybrid format.
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