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How to Change Garmin DC-40 Antennas - YouTube
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Amazon.com: Outdoor Dog Supply's Reflective Glow Tuff Long Range Collar Antennas for The Garmin Dc30 & Dc40 Tracking Collars (Reflective Red) : Electronics
New Antenna GPS Dog Tracking Collar for Garmin DC30 DC40 Suitable for Astro 220 320 430 Alpha 100 50