HWU transmitter, Military radio transmitter in Rosnay, France
The HWU transmitter in Rosnay is a military radio facility with thirteen guyed masts ranging from 270 to 357 meters in height. These masts enable long-distance radio communications with submarines across vast ocean areas.
The site was built after World War II to strengthen France's naval communication capabilities with modern technology. It became essential infrastructure for maintaining independent military radio links with the submarine fleet.
The facility represents France's commitment to maintaining independent military communications infrastructure for its naval forces across extensive maritime areas.
The transmitter operates on several low-frequency bands and can be received from locations across Europe with basic equipment. Visitors should approach the site from a safe distance, as it remains an active military facility.
The main mast stands at 357 meters and ranks among the tallest structures in France. This exceptional height allows radio contact with submarines positioned at distant locations beneath the ocean surface.
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