Adjustable 20” J-bar outdoor antenna mounting pole for use with SureCall cell phone signal boosters and antennas. 1” diameter, 20” length. The J-mount allows you to get your cellular phone booster antenna higher for optimum cellular reception. Our universal mounting pipe allows you to position your exterior antenna higher for optimal reception. The bracket attaches to any flat surface including a roof, fascia, side of house, or deck rail.