SSBN antenna at Kerlouan is used by the French Navy to communicate with submarines, using very low frequency waves.

These waves (also named VLF), in the range of 3 kHz to 30 kHz, can penetrate water to a depth of roughly 10 to 40 metres (30 to 130 feet) and signals can reach a few hundreds Kw power.

Aerials are located at Rosnay, Sainte Assise, Kerlouan and Toulouse.

Site altitude : 197 feet

Pylon height : 1017 feet

Military use only.

Coordinates : 48° 38'16.06 N - 04° 21'02.45 W

Aeronautical location : 13.5 miles  from  Brest-Guipavas airport (LFRB),  heading 13.

This scenery of a strategic site has been roughly developped on purpose.

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