Remote Radar Head Brizlee Wood, is an air defence radar station operated by the Royal Air Force located at Brizlee Wood, near Alnwick in Northumberland, England. Originally opened as an Ace High site in the early 1960s, it now forms part of the Air Surveillance and Control System (ASACS) of the Royal Air Force.

Allied Command Europe Highband, better known as ACE High, was a fixed service NATO radiocommunication and early warning system dating back to 1956. After extensive testing ACE High was accepted by NATO to become operational in 1964/1965.