The Astro/Alpha Portable Long Range Antenna is designed to increase the range of the hunter’s handheld receiver, by up to three miles. When a dog travels outside the Astro/Alpha’s range, the antenna can be lengthened to over a meter and attached directly to the Astro 220, 320 or Alpha via a one-meter coaxial cable (included). The antenna features a molded handle and lanyard, and measures just a quarter meter long when stored – small enough to be carried in a hunting vest when not in use.