Garmin External GPS/Iridium Antenna with Adapter Cable for Montana with inReach Garmin External GPS/Iridium Antenna with Adapter Cable for Montana with inReach Garmin's external passive antenna/extension cable enables your to install an external GPS/Iridium antenna with your Garmin Montana 700i or 750i. Can be used on the exteriors of vehicles or buildings as antenna is magnetic. SKUGAX1288106 MAN#010-12881-06 ID#: 6407 Our Price: $64.95 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.