Marine / CB Radio Tram-Browning Long Range Magnet Mount Antenna. Will Come with a PL-259 Connector which is NOT compatible your Garmin Alpha / Astro System.

Extra Long 49" whip extends your tracking range even further.  This antenna magnet is larger and more powerful. 

14Ft of Cable.

Choose to add a Spring for additional flexibility to minimize the chance of your antenna whip snapping