Garmin Antenna - Long Range Extendable FlexiBase – Strictly Outdoors
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5 - 14" Flexible Long Range Antenna - Garmin Alpha 100 / Astro 220 / 320 / 430 | eBay
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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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