Feature:1. The high gain antenna is a high gain antenna of super quality, which is made of metal. Sturdy and durable.2. Folding telescopic antenna suitable for garmin astro 320 430 900 alpha 50 100 portable gps.3. The antenna receives a stable and strong signal, which increases the range you can obtain.4. The installation method is simple. You just need to install it by hands and does not require complicated tools.5. The antenna comes with direct sma connectors for garmin astro and for alpha. Fit for astro and for alpha through a standard sma.Specification:Item Type: High Gain AntennaMaterial: MentalApplicable Model: For Garmin antenna Handheld GPSFolded Size: Approx. 21.7cm/8.5inExtended Size: Approx. 127cm/50inVHF Frequency: 136-174mHzGain: 3.0dbiHow to Use:This antenna increases the range you get.Easily install the flexible antenna by hand comes with direct sma connectors for garmin astro and for alpha.It is a portable antenna for Garmin alpha 50, for alpha100, for garmin astro 320, 220, 430 and for 900 handheld devices..Package List:1 x Telescopic Antenna