This antenna increases the range you got.
It's easy to install the flexible antenna just screw it by your hand, it comes with a direct SMA connector for Garmin Astro and Alpha.
Best handheld antenna for Garmin Alpha 50 and Alpha100, Garmin Astro 320, 220, 430 and 900 handhelds.
Folded size: 21.7cm
Extended size: 127cm
Connects via standard SMA connection direct plugging to your Astro/Alpha.