Wikipedia
WXTU (92.5 FM, "92-5 XTU") is a Country music formatted radio station which is broadcast in the Philadelphia area. It is the largest country radio station in the United States based on listener cume ( WUSN in Chicago is the second largest). The station plays a variety of country music, including current hits, as well as older hits. WXTU is owned by CBS Radio, and is Philadelphia's only country radio station. Its transmitter is located in the Roxborough section of the city. WXTU also broadcasts commercial free country music on one of its HD Radio channels, which is separate from the main programming. The WXTU studios and offices are located in the "555 Building" in Bala Cynwyd, Pennsylvania.
Since the advent of the Portable People Meter by Arbitron in Philadelphia, WXTU has become the most listened to country station in the United States (based on listener cume). This distinction was formerly held by WUSN in Chicago, owned by CBS Radio. Although, since PPM service is not yet available in Chicago, this is in dispute.