The Radiall/Larsen Mirage VHF low profile mobile antenna offers a compact design, just 3.75" tall and 4.5" in diameter, and mounts on the industry standard NMO 3/4" mount. The Mirage features a durable UV and chemical resistant Makroblend resin polymer plastic housing and a Super Seal gasket to seal around the mount as well as the diameter of the antenna. Ground plane is required.