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Amazon.com: Protective Pouch Case Cover Holster, Compatible with Garmin Astro 220, 320, 430, Alpha 100, Made in U.S.A. : Electronics
Garmin Astro - DC30 vs DC40
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Amazon.com: High Gain Long Range Magnetic Base Replacement Antenna Compatible with Garmin GPS Alpha 100 200 200i Astro 220 320 430, Eifagur : Electronics
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Muti-Color Long Range 36cm FP-71 SMA-Male Flexible Antenna for Handheld GPS Garmin Astro 220 320 430 900 Alpha 50 Alpha 100 - AliExpress