It later started or acquired other publications, including Armstrong Daily, the Philadelphia Daily News, Seventeen magazine, TV Guide, Good Food magazine, Official Detective magazine, and television and radio stations, including WFIL-AM-FM-TV in Philadelphia, WLYH-TV in Lancaster and Lebanon, Pennsylvania, WFBG-AM-FM-TV in Altoona and Johnstown, Pennsylvania, WNHC AM-FM-TV in New Haven, Connecticut, WNBF-AM-FM-TV in Binghamton, New York, and KFRE AM-FM-TV in Fresno, California.
The magazine provided local listings with feature stories and soon became the largest national weekly publication, reaching up to 23 million households at its peak in the 1970s.
This new facility housed all aspects of the publication, including managerial, marketing, production, photography, editorial and subscription services.
Another Triangle success was Seventeen magazine, a publication started by Annenberg in 1944, featuring fashion tips and advice for teenage girls.
Triangle merged the regional editions into a single broadsheet in the early 1970s when it moved operations into a new facility in Hightstown, New Jersey.
Triangle entered the broadcasting industry with the 1947 purchase of WFIL in Philadelphia from the department stores Lit Brothers and Strawbridge and Clothier.
Triangle also pioneered the concept of facsimile transmission (fax) over an FM band, transmitting its Philadelphia Inquirer as WFIL-FX.
While owned by Triangle, WFIL's AM, FM, and television stations were first broadcast from the Widener Building in Center City, Philadelphia.
In 1948, Triangle built the first broadcast center specifically designed for television, at 4645 Market Street in Philadelphia, which later became the home of American Bandstand with Dick Clark.
[1][2] In January 1964, Triangle moved its WFIL stations and broadcasting division operations into a new state-of-the-art facility at 4100 City Avenue in the suburban Philadelphia Main Line region.
[4] Gateway made its move in 1974 by acquiring non-Triangle station and an ABC affiliate WHTN-TV from Reeves Telecom, and rechristened as WOWK-TV in 1975.
[5] In 1988, Triangle Publications' remaining assets were sold to Rupert Murdoch's News Corporation for 2.83 billion dollars, in one of the largest financial transactions of the time.