Windex 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. Windex 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 Teflon® bearings. Complete with 15 (38 cm) vane, reflective tacking arms, hardware and instructions for easy installation. Antenna not included.