The new WFIL was an affiliate of NBC; some sources say the station never became established as either a "basic Red" or "basic Blue" outlet, but at least one early WFIL advertisement claimed that it was a "basic Blue" station. Westinghouse's KYW had replaced WFI-WLIT as the NBC primary for Philadelphia when it moved in from Chicago, Illinois a few years before. Starting in December 1944 the station produced "Hayloft Hoedown", picked up by ABC Radio in 1945. WFIL was purchased in 1947 by Walter Annenberg's Triangle Publications, which also owned "The Philadelphia Inquirer". By then WFIL was an affiliate of the newly named ABC Radio Network. WFIL's sister stations under Triangle Publications ownership were WFIL-FM and WFIL-TV in Philadelphia; WNHC AM-FM-TV in New Haven, Connecticut; KFRE AM-FM-TV in Fresno, California; WFBG AM-FM-TV in Altoona, Pennsylvania; WNBF AM-FM-TV in Binghamton, New York; and WLYH-TV in Lancaster/Lebanon, Pennsylvania. Triangle Publications sold WFIL AM-FM-TV to Capital Cities Broadcasting in 1971 with the radio stations spun off to new owners, WFIL to LIN Broadcasting and WFIL-FM to Richer Communications which changed the call letters to WIOQ. WFIL-TV took on the new call letters of WPVI-TV. Studios for the early WFIL radio stations were in the Widener Building in downtown Philadelphia. Under Triangle Publications' ownership the stations were moved to a new broadcast facility at 46th and Market Street in West Philadelphia adjacent to the Arena, the first broadcast facility in the nation specifically designed for television broadcasting. It was in this new broadcast center that Triangle began broadcasting "Bandstand" (later called "American Bandstand"), first with Bob Horn, then with Dick Clark as host. Clark started on WFIL radio as a disc jockey in 1952, arriving from Utica, New York. He continued hosting the TV program for 31 years, the last 30 as a national show carried by the ABC Television Network. Clark moved the program to Hollywood in 1964. Shortly after Clark's emergence on the national stage, he became a major figure in the early days of rock and roll as "Bandstand" proved pivotal in helping promote the major stars of the era. The WFIL studio at 4548 Market Street was listed on the National Register of Historic Places in 1986 for its significance as one of the first buildings constructed specifically for television broadcasting, as well as being the site for "American Bandstand".