Listen to the "103.5 KTU" radio station live. The "103.5 KTU" studio is located in Lake Success, NY. Callsign: WKTU. Broadcasting region: New York metropolitan area. Start of broadcasting: September 1, 1958. Program format: Rhythmic adult contemporary. Musical style: disco, classic hip-hop, dance pop, and house music of the late 1980s/early 1990s. Target audience: 25–54 years old. Audience Reach: 20 140 470.