Pierre-sur-Haute military radio station
The Pierre-sur-Haute military radio station is a French military communications site that has been in use since 1913. The 30-hectare (74-acre) station is located on a hilltop in the Sauvain and Job communes 45.6531°N 3.8084°E. The site contains three towers, the tallest of which is a 55-metre-high civilian telecommunication tower owned by Télédiffusion de France.
Source: Wikipedia — Pierre-sur-Haute military radio station (CC BY-SA 4.0)