Long Range Super 6" Magnectic Antenna with Spring Whip for your Garmin Astro 220, 320, 430 or Alpha. Advantages of the 6' magnet are they will hold up to more abuse and low hanging limbs better. Also with the new spring whip this will help keep your antenna from being knocked off the truck. This antenna will out perform the Garmin Magmount. Ranges will vary depending on terrain and conditions.