This antenna increases the range you have. It's easy to install the flexible antenna just screw it by your hand, it comes with a direct SMA connector for Astro and Alpha. Best handheld antenna for Alpha 100 200 300 300i 200i 50 10, Astro 320, 430, 900 Foldede size: 25cm Extended size: 108cm Frequency: 136-174MHZ Connects via standard SMA connection direct plugging to your Astro/Alpha. Boost your GPS device's performance with the High Gain Telescopic Antenna! It is suitable for Alpha 200, 300, 300i, 200i, and Astro series, this Foldable Long Range Antenna extends up to 108cm, ensuring reception in even the most remote areas. Its SMA Telescopic Antenna design allows for easy, tool-free installation, making it a must-have for outdoor enthusiasts. Compact when folded (25cm) and highly , this antenna is the perfect companion for your device, ensuring reliable connectivity wherever your adventures take you! Color: Black Material: plastic Package Contents: 1 * Antenna Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.