Bird B Gone Repeller 360° spins in the wind to prevent large birds such as gulls, pigeons and crows from landing in areas where pest birds create problems, including boats, docks, AC units, light posts, signs, rooftops, skylights and more. The unit deters pest birds in a 6-ft.-diameter swath. It features two “sails” mounted at both ends of a 6-ft. stainless steel arm, each with a reflective and intimidating predator eye. When the wind spins, the unit’s arms intimidate and frighten any bird pests daring to land near them. The wind-powered arms rotate continuously in the slightest breeze.