For any question about AERO products including the AERO L1/L2 GPS Antenna AT2775-138 please contact Apollo SatCom. Antennas are among the most important electronic components of any Vessel, UAV or UAS, they allow the vehicle to transmit information to and receive information from other systems, as well as the people on the ground. All AERO Antenna Technology Products are available through Apollo Satellite. We have a large selection of antennas in stock and can ship them out the same day. The usual build time for custom or non-inventory antennas is 4 to 8 weeks. Aviation Antennas, GPS Antennas, Iridium Antennas, Ground & Vehicular Antennas, Marine Antennas, and VHF Antennas are all manufactured by AERO Antenna.