This upgraded high-gain antenna is designed for Garmin Alpha 100, 50, Astro 320, 220, 430, and Alpha 100 Handheld GPS devices. It helps extend signal range for improved performance. The antenna features a direct SMA connector, ensuring a secure and straightforward connection to Garmin Astro and Alpha series devices. It is constructed from durable metal materials for long-lasting use. This foldable and extendable antenna delivers a strong and stable signal. The compact folded size is approximately 25 cm (9.9 in), and the extended length is approximately 108 cm (42.5 in). It operates within a frequency range of 136–174 MHz. Package includes: 1 x Telescopic Antenna. We prioritize customer satisfaction. If you receive a damaged item or incorrect quantity, please contact the seller for assistance with after-sales support.