Amazon.com: High Gain Long Range Magnetic Base Replacement Antenna Compatible with Garmin GPS Alpha 100 200 200i Astro 220 320 430, Eifagur : Electronics
Amazon.com: EXSI.CO Antenna Quick Connect kit Compatible for Garmin Astro 320 and Alpha 100 200i : Electronics
Garmin Alpha 300 200 100 Astro 320 430 Quick Connect Antenna Attachment 3 Pc Set | eBay