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Amazon.com: Extended Long Range Flexible Receiver Orange Antenna Upgrade 15 inch Whip Antenna for Garmin GPS Alpha 100 200 Astro 220 320 430, Roniware : Electronics
Banggood Long Range 38cm Flexible Antenna For Handheld Gps Garmin Astro 220 320 430 900 Alpha 50 Alpha 100 Accessories - Ac/dc Adapters - AliExpress
Amazon.com: High Gain Long Range Magnetic Base Replacement Antenna Compatible with Garmin GPS Alpha 100 200 200i Astro 220 320 430, Eifagur : Electronics
Extendable Foldable Antenna for Garmin Alpha & Astro