Modern lattice towers and guyed masts are also commonly assembled of prefabricated elements. Guyed masts are frequently used for radio antennas. The TV Alabama Tower and the WTTO Tower near Windham Springs are guyed TV masts. Sailing masts, the masts that support the sails on sailboats, are also typically guyed masts. Guyed masts are sometimes also constructed out of steel tubes. Most mast radiators are built as guyed masts insulated from the ground at the base. Nearly all sailing masts are guyed. Towers carrying horizontally spun wire antennas are sometimes additionally guyed. Guyed lattice towers such as these masts had held the world height record since 1954. A T-aerial is used, strung between two guyed masts. It has a guyed steel tubular mast. A thin vertical mast supported by guy wires is called a guyed mast. The Kryvyi Rih TV Mast is a 185m-tall, guyed tubular steel mast, built in 1960. The station's antenna was a vertical guyed tubular steel mast aft of the bridge. Orenburg TV Tower is a guyed mast of unusual design.