WIP-FM

WIP-FM (94.1 FM) — branded Sports Radio 94 WIP — is a commercial sports radio station licensed to Philadelphia, Pennsylvania serving the Delaware Valley area. Owned by CBS Radio, the WIP-FM studios are located on the 9th floor of 400 Market Street in Philadelphia, PA, and the station's transmitter is located in the Roxborough section of Philadelphia. Since 1992, WIP-FM has served as the flagship station for the Philadelphia Eagles.

On September 2, 2011, the station ended its run as classic rock station 94 WYSP.

Start as WIBG-FM

In Philadelphia, FM frequency 94.1 began as WIBG-FM, the sister station of WIBG, and mostly simulcast the AM top-40 station until the mid-1960s, when it began to experiment with a prerecorded "underground rock" format without announcers. In 1968, owner Storer Broadcasting shut the station down while attempting to get permission for an increase in transmission power. WIBG-FM was a restricted class B station at the time, limited in range to avoid interfering with WKOK-FM in Sunbury, Pennsylvania. During 1969, the call letters were officially changed to WPNA when Storer sold WIBG (AM). The station remained silent and the call sign would be changed again before it returned to the air.