High Quality Content by WIKIPEDIA articles! Y-stations were British Signals Intelligence collection sites initially established during World War I and later used during World War II. These sites were operated by a range of agencies including the Army, Navy and RAF plus the Foreign Office (MI6 and MI5), General Post Office and Marconi Company receiving stations ashore and afloat. The "Y" stations tended to be of two types, Interception and Direction Finding. Sometimes both functions were operated at the same site with the direction finding (D/F) hut being a few hundred metres away from the main interception building because of the need to minimise interference.

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