Docooler&reg; HDTV Antenna X-71 Indoor Digital High Definition Home with Sucker 450-860MHz F Male Connector for HDTV / DTV for United States Specially designed to receive digital signals, and it provides viewers the opportunity to receive hundreds of crystal clear digital and HD shows for free. No expensive and unnecessary cable bills needed. Setting it up couldn't be easier: Simply screw the cable into the existing antenna or cable port on your TV, and attach the lightweight, razor-thin antenna to a window or exterior wall (with included suction cups). Fibrous material FR-4, copper coated copper wire shield GB. No external power required. F Male connector is suitable for United States.