Garmin Magnetic Mount Antenna for Astro/Alpha Garmin Magnetic Mount Antenna for Astro/Alpha Powerful Magnetic Mount for your Astro or Alpha unit. SKUGAX10931 MAN#010-10931-00 ID#: 3315 Our Price: $34.95 Availability: In Stock Condition: Brand New Add to cart We’re sorry for the inconvenience, but please know we are working hard to replenish stock and fill backorders. Global shipping constraints and other material shortages have slowed the supply of products in many industries, including GPS and Marine electronics. We update the Estimated Shipping Date on our website in real time, so feel free to check back frequently. Thank You for your patience and for shopping with The GPS Store, Inc.