CFS Masset, Military base in British Columbia, Canada

CFS Masset was a Canadian Forces signals intercept station near Masset, British Columbia, built in 1942 and active from 23 February 1943. Its Wullenweber AN/FRD-10 antenna, erected in 1971 for the shore-based HF/DF Project Clarinet Bullseye, remained in use after that project ended. The site was stood down on 1 April 1997 and became CFS Leitrim Detachment Masset, operated remotely from Leitrim.

Built in 1942 as Naval Radio Station Masset, it began operating on 23 February 1943 as a high-frequency direction-finding intercept and ship-to-shore relay station. After postwar caretaker status and reactivation in 1949, an earthquake forced suspension until 1951, when it joined the SUPRAD system. Redesignated CFS Masset in 1968, it received a Wullenweber AN/FRD-10 antenna in 1971 for Project Clarinet Bullseye. It was stood down on 1 April 1997 and became CFS Leitrim Detachment Masset.

The station's name comes from Masset, the village on Graham Island about 6 km to the west. Its Cold War role was signals intelligence: the AN/FRD-10 Wullenweber antenna built in 1971 located and classified ships as part of Project Clarinet Bullseye. Since 1997 the equipment has been run remotely from CFS Leitrim in Ontario.

Access to the installation is restricted and requires proper identification and security clearance for entry. Visitors should arrange authorization in advance and follow all security procedures upon arrival.

In 1971 a Wullenweber AN/FRD-10 circular antenna array was built at the station as part of Project Clarinet Bullseye, a shore-based HF/DF system to locate and classify ships. The array stayed in service after that project ended, and the site was stood down on 1 April 1997.