Feature: 1. This is an upgraded high-gain antenna designed for superior performance. 2. Compatible with Garmin Alpha 100, 50, Astro 320, 220, 430, and Alpha 100 Handheld GPS devices. This antenna helps extend signal range. 3. Easy to install with direct SMA connectors for Garmin Astro/Alpha series. Connects via standard SMA male connection. 4. Constructed from high-quality metal materials for durability and long-term use. 5. Foldable and extendable design with reliable signal reception, offering convenience and stability during use. Specification: Item Type: Telescopic Antenna Material: Metal Folded Size: Approx. 25cm / 9.9in Extended Size: Approx. 108cm / 42.5in Frequency: 136–174 MHz Package List: 1 x Telescopic Antenna