The Antop Antenna AT-307 is an indoor HDTV antenna with a 35-mile signal range, designed for receiving free Over-the-Air digital TV signals. It supports HDTV, 1080P, and 4K ULTRA HD formats, and is compatible with digital converter boxes. The antenna features adjustable loop and telescopic elements for UHF and VHF reception, a gain attenuator for fine-tuning, and comes in a piano white finish.