Under Triangle ownership the WNHC stations moved to a new studio facility, on College Street in downtown New Haven, around 1960. This left channel 8 as a sole ABC affiliate, although it shared ABC programming with WATR-TV (channel 20, now WCCT-TV) in nearby Waterbury until 1966.

Also that same year, WNHC-TV lost its CBS affiliation when that network purchased WGTH-TV in Hartford (channel 18, later WHCT and now Univision affiliate WUVN). In 1956, the WNHC stations were purchased by Philadelphia-based Triangle Publications. WNHC-TV shared some CBS programming with New Britain's WKNB-TV (channel 30, now NBC owned-and-operated station WVIT) until 1955, since WKNB's signal was not strong enough to cover New Haven at the time. The next year, the FCC collapsed New Haven and Hartford into a single market. As a result, WNHC-TV changed frequencies and moved to channel 8 in December 1953. When the Federal Communications Commission (FCC)'s Sixth Report and Order ended the four-year freeze on television construction permit awards in 1952, it also reorganized channel allocations to alleviate interference issues. The station was the first in the country to use videotape for local programming and one of the first to broadcast in color. In October 1948, the station added CBS programming to its schedule, and additional secondary affiliations with NBC and ABC followed a year later. For a time, WNHC-TV simply rebroadcast the signal of DuMont's New York City flagship, WABD (now Fox flagship WNYW). However, with no studio facilities of its own, it could not produce local programming. The station originally broadcast from WNHC radio's building on Chapel Street in downtown New Haven. WNHC-TV was originally an affiliate of the DuMont Television Network, and claims to have been the first full-time affiliate of that short-lived network. Ray, Chief Engineer and Aldo DeDominicis, a radio salesperson. Elm City Broadcasting founded WNHC radio in December 1944 and was principally owned by Patrick J.

The station was founded by the Elm City Broadcasting Corporation, owners of WNHC radio (1340 AM, now WYBC and 99.1 FM, now WPLR). It is the oldest television station in Connecticut. WTNH first went on the air on June 15, 1948, as WNHC-TV, originally broadcasting on channel 6. Both stations share studios on Elm Street in downtown New Haven per a channel sharing agreement, the stations transmit using WTNH's spectrum from a tower in Hamden, Connecticut. It is owned by Nexstar Media Group alongside MyNetworkTV affiliate WCTX (channel 59), also licensed to New Haven. WTNH (channel 8) is a television station licensed to New Haven, Connecticut, United States, serving the Hartford–New Haven market as an affiliate of ABC.

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