Outdoor Dog Supply Reflective Glow Tuff Long Range Collar Antennas The Garmin Dc30 & Dc40 Tracking Collars Works with the Garmin DC30 and DC40 tracking collars Reflective striping for great night time visibility 20" long - tracks further than the original that comes on the collars Heavy duty, well made, in the USA Comes with Outdoor Dog Supply's Warranty