Hundreds of HD channels are available in millions of homes and businesses both terrestrially and via subscription services such as satellite, cable and IPTV.
[1][failed verification] In the US, the 720p and 1080i formats are used for linear channels, while 1080p is available on a limited basis, mainly for pay-per-view and video on demand content.
[5] Satellite television companies in the United States, such as Dish Network and DirecTV, started to carry HD programming in 2003.
Currently, HD programming is carried by all major television networks in nearly all DMAs, including ABC, CBS, NBC, FOX, PBS, The CW, MyNetworkTV, Telemundo, Univision, and UniMás; and on many independent stations.
HD programming on broadcast and premium networks such as HBO and Showtime had Dolby Digital 5.1.