This upgraded high-gain antenna is designed for Garmin Alpha 100, 50, Astro 320, 220, 430, and Alpha 100 Handheld GPS devices. It helps increase signal range for improved performance. The antenna features a direct SMA connector for easy installation on Garmin Astro and Alpha series devices, ensuring a secure and standard SMA connection. Constructed from high-quality metal materials, it offers durability and long-term reliability. The foldable and extendable design provides a strong and stable signal, enhancing convenience during use. The antenna measures approximately 25 cm (9.9 in) when folded and extends to 108 cm (42.5 in). It operates within a frequency range of 136–174 MHz. Package includes: 1 x Telescopic Antenna. If you encounter any issues upon receiving the product, such as damage or incorrect items, please contact the seller for assistance with after-sales support.