This vintage Alliance Tenna Rotor Model U-100 Antenna Rotator Control Box has been tested and is in good working condition. It is a universal antenna rotator control box that is compatible with base station radios. The motorized rotation feature allows for easy and precise positioning of your antenna. The U-100 model is designed to work with both UHF and VHF bands and is made of durable plastic material. This unit is a great addition to any ham or amateur radio enthusiast's collection.