WRC-TV (channel 4) is a television station in Washington, D.C., serving as the market's NBC outlet. It is owned and operated by the network's NBC Owned Television Stations division alongside Class A Telemundo outlet WZDC-CD (channel 44). WRC-TV and WZDC-CD share studios on Nebraska Avenue in the Tenleytown neighborhood of Northwest Washington. Through a channel sharing agreement, the stations transmit using WRC-TV's spectrum from a tower adjacent to their studios. History The station traces its roots to experimental television station W3XNB, which was put on the air by the Radio Corporation of America, the then-parent company of NBC, in 1939. A construction permit with the commercial callsign WNBW (standing for "NBC Washington") was first issued on channel 3 (60–66 MHz, numbered channel 2 prior to 1946) on December 23, 1941. NBC requested this permit to be cancelled on June 29, 1942; later, the channel 3 allocation was reassigned to Harrisonburg, Virginia, on which the former Shennandoah Valley Broadcasting Company launched WSVA-TV (now WHSV-TV) in 1953. On June 27, 1947, WNBW was re-licensed on channel 4 and signed on the air. Channel 4 is the second-oldest commercially licensed television station in Washington, after WTTG (channel 5), which signed on seven months earlier in December 1946. WNBW was also the second of the five original NBC-owned television stations to sign-on, behind WNBT in New York City and ahead of WNBQ in Chicago, WNBK in Cleveland and KNBH in Los Angeles. The station was operated alongside WRC radio (980 AM, now WTEM, and 93.9 FM, now WKYS). On October 18, 1954, the television station's callsign changed to the present WRC-TV to match its radio sisters. The new calls reflected NBC's ownership at the time by RCA. It has retained its "-TV" suffix to this day, nearly four decades after the radio stations were sold off and changed call letters. The WNBW call sign was later used for the NBC affiliate in Gainesville, Florida since the station's launch in 2008. In 1955, while in college and serving as a puppeteer on a WRC-TV program, Jim Henson was asked to create a puppet show for the station. The series he created, Sam and Friends, was the first series to feature the Muppets, and launched the Jim Henson Company. The second presidential debate between candidates John F. Kennedy and Richard M. Nixon was broadcast from the station's studios on October 7, 1960. David Brinkley's Washington segment