[Special]: Our antenna + Your handheld GPS = A perfect match. This extended range antenna can help you track your hunting dog, even in areas with dense vegetation. [Improve Signal]: Made from high-quality materials, each antenna has been rigorously tested with professional instruments for better signal performance, increasing the communication reception distance for your handheld GPS. [Compatible Models]: Compatible with Track and Train Handheld GPS for Alpha 100, 200, 200i, Astro 220, 320, 430. [Durable]: The antenna can withstand high temperatures, cold, and ice, and is resistant to rain, making it suitable for outdoor work. Connector: SMA Male; Gain: 3.5dBi; VSWR: Less than 1.5; Impedance: 50 ohm; Color: Black & Orange Material: Plastic Package Contents: 1 x Antenna Only the above package content is included; other products are not. Note: Light reflections and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowed measurement error is +/- 1-3 cm.