Superior PerformanceThe Hyperlink 8.1- 5.8 GHz High-Performance Parabolic Dish Wi-Fi Antenna is ideal for directional 5 GHz ISM / UNII band applications. It features 23 dBi of gain with a 9° beam-width. These antennas can be oriented for either vertical or horizontal polarization.Rugged and WeatherproofThe reflector dish of these antennas is constructed from high quality aluminum which gives them superior strength. The dish is coated in a light gray UV-inhibited polymer for durability and aesthetics. The small diameter of the dish helps minimize wind loading.These antennas are supplied with a tilt and swivel mast mount kit. This allows installation at various degrees of incline for easy alignment. The HG5158-23D can be adjusted up or down from 0° to 60°.