RAF Menwith Hill

Royal Air Force Menwith Hill or more simply RAF Menwith Hill is a Royal Air Force station near Harrogate, North Yorkshire, England which provides communications and intelligence support services to the United Kingdom and the United States of America. The site contains an extensive satellite ground station and is a communications intercept and missile warning site and has been described as the largest electronic monitoring station in the world.

RAF Menwith Hill is commanded by a Royal Air Force Officer, supported by an RAF element, whilst the majority of support services were provided by the United States Air Force, 421st Air Base Group until 2014.

The site acts as a ground station for a number of satellites operated by the US National Reconnaissance Office, on behalf of the US National Security Agency, with antennae contained in a large number of highly distinctive white radomes, and is alleged to be an element of the ECHELON system.

History

Menwith Hill Station was opened on 545 acres (2.21 km²) of land acquired by the British War Office in 1954 and leased to the United States. The United States Army Security Agency established a high frequency radio monitoring capability, monitoring communications emanating from the Soviet Union, operating from 1958.