In late 1955, NBC persuaded Westinghouse to trade its Philadelphia stations, KYW (1060 AM) and WPTZ-TV, in return for NBC's Cleveland properties and $3 million in cash compensation. NBC had long wanted to own a station in Philadelphia, the nation's third-largest market at the time. The swap went into effect on January 22, 1956. Westinghouse wanted to keep the historic KYW callsign, which had been Chicago's oldest radio facility before being transferred to Philadelphia on December 3, 1934. Therefore, on February 13, 1956, the Cleveland stations became KYW, KYW-FM and KYW-TV; and the Philadelphia stations became WRCV and WRCV-TV. The WTAM callsign was later picked up by WGLS in Atlanta, Georgia, and after that by WGCM-FM in Gulfport, Mississippi.