Targeting towers use a special device to ensure an antenna's stability when strong wind blows.
Three vertical rods are used to maintain the top platform horizontal when the tower bends under the wind effect.
The top platform is pin connected to the mast, thanks to a special mechanical link based on universal joint system.
The system allows to reduce the size and the weight of the towers, because contrary to standard poles, stiffness is not needed.
[1] In standard towers, the antenna beam's rotation must not exceed a certain angle (currently between 0.5° and 2°), otherwise the communication is cut.