After WRAL-TV took the ABC affiliation full-time in 1962, WTVD was forced to shoehorn CBS and NBC programming onto its schedule. This was a very unusual arrangement for what was then a two-station market. The Triangle was, at least on paper, big enough even then to support three full network affiliates. However, the only other VHF license in the market, channel 4, had already been taken by National Educational Television outlet WUNC-TV. UHF TV broadcasting was not considered viable at the time. Not only were television manufacturers not required to include UHF tuning capability until 1964, with the passage of the All-Channel Receiver Act in 1961, but the available UHF frequencies were not thought to be nearly strong enough to cover a market that stretched from Chapel Hill in the west to Goldsboro in the east. This situation was similar to that of WAPI-TV (now WVTM-TV) in Birmingham, Alabama. However, unlike WAPI-TV, WTVD managed to find room for "The Ed Sullivan Show", the "CBS Evening News with Walter Cronkite" and "The Tonight Show Starring Johnny Carson".