 The station is available on FM in most of Great Britain, parts of Ireland and the north of France; LW throughout the UK and in parts of Northern Europe, and the Atlantic north of the Azores to about 20 degrees west; MW in some areas; DAB; Digital TV including Freeview, Freesat, Sky and Virgin Media, and on the Internet.Freesat, Sky and Virgin have a separate channel which broadcasts the Radio 4 LW output in mono, in addition to the FM output.The longwave signal is part of the Royal Navy's system of Last Resort Letters.