guyed at four levels, and carries booms at 20 m intervals in three directions. The 9.4 m booms can be swung up hydraulically, so that instruments at their ends can be handled from an upper balcony; this swivelling mounting allows much longer booms than the customary sideways-sliding construction. Permanent signal cables in the boom tubes run through the hollow swivel axis, so during boom motion they are only torsion-deformed, a more endurable load than bending. Built around the mast foot is a 200 m2 streamlined building for registration and maintenance purposes. On top of the mast, a compact weather radar was installed in 2007, measuring precipitation up to a radius of 60 km around the mast. References In Higher Spheres; 40 years of observations at the Cabauw Site. Wim Monna and Fred Bosveld, 2013. KNMI-Publication 232 External links Diagram at skyscraperpage.com. Description at KNMI. Current meterorological data. Real-time weather radar measurement from the mast top. See also List of masts Guyed masts Communication towers in the Netherlands Towers in Utrecht (province) Lopik Towers completed in 1972 1972 establishments in the Netherlands