RTÉ One (Irish: RTÉ a hAon) is the Republic of Ireland's oldest and most popular television channel, operated by the state public service broadcaster Raidió Teilifís Éireann. It broadcasts 24 hours a day. Its headquarters is at Donnybrook, Dublin. RTÉ One is almost universally available on the VHF and UHF bands on the island of Ireland (though VHF has mostly been phased out), and is available on the most digital services available in the Republic of Ireland (Sky Ireland, UPC Ireland, Magnet Networks, and SCTV Digital). It is available in Northern Ireland on Sky Ireland and Virgin Media.