Channel 4 launched an HD feed on December 10, 2007 which is still available on pay-tv carriers. Users tuning Channel 4 via the free-to-air grid will only have access to the SD feed. Channel 4 broadcasts shows from independent companies, which made them the first TV channel in the UK to do so on a large scale. During the late 90s, Channel 4 aired some of the most popular shows in the United States such as Friends or ER, which made their debut in the UK via this channel. Channel 4 is a public, free-to-air British television network. It is owned by Channel Four Television Corporation, a branch of the Department for Digital Culture, Media, and Sport. The channel was launched on November 2, 1982 as a fourth television service in the United Kingdom along with BBC One, BBC Two and ITV. This channel as originally a subsidiary of the Independent Broadcasting Authority. The channel’s headquarters are located in Leeds.