Garmin VHF Antennas f/AlphaTrade DC by Garmin Sold out This product ships from the United States 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Sold out Compatible Devices Alpha, Astro, Astro 220, DC 20 Dog Tracking Collar. Use these antennas with your Astro or Alpha. Includes 1 for DC 20. 1 for Astro 200. Box Dimensions 1h x 5W x 9L. Weight 0.2lbs.