Un-Powered Hinge System for PowerTower. The Hinge System is designed to safely pivot your satcom installation through 180° significantly lowering the height of the installation. Designed to fit 30cm satcom antenna ONLY. Unpowered System - Passive system requires no additional power. All movement will be done by hand, No tools required - Fastened by hand, no tools required, using hand knob - can be used at any time, Easy height reduction - Designed to lower height of installation for passing under bridges, winter storage, trailing and boat stacking, Tidy installation - Low profile mounting which routes cables internally keeping the installation neat and tidy.