The ClearStream J-Mount is a 20" mast with a 1" diameter. This mast is the perfect size for the ClearStream 1MAX, the ClearStream MAX-V or the ClearStream MAX-V Pro antennas. Made with all-weather, powder-coated, galvanized steel. The pivoting base allows for installation on vertical or horizontal flat surfaces, such as a roof, fascia, deck rail, or the side of your house. Includes adjustable mounting hardware and sealing pads.