WindTrak AV Antenna Mount Wind VaneWindTrak wind vanes continue to offer exceptional performance at the best value of any wind indicator worldwide. The secret is in the sapphire jewel suspension bearing, large fin-low inertia vane, and easy-to-read, fully adjustable tacking tab system.WindTrak AV installs onto most whip antennas, including Metz and Shakespeare brands, with a whip diameter less than 1/8" (3 mm). Combine two installations into one to reduce masthead clutter, weight, and windage aloft. Rides on low-friction TeflonA(R) bearings. Complete with 15" (38 cm) vane, reflective tacking arms, hardware and instructions for easy installation. Antenna not included. Specifications: Instrument Function: Wind Type: Wind Indicator Box Dimensions: 3"H x 6"W x 18"L WT: 0.5 lbs UPC: 011698316007