190-01499-02 GTX 3X5 Transponder TSO Installation ManualRev. 4 Page 3-93.8 GPS Antenna RequirementsUse an antenna in table 3-8 to get the best performance with the GTX 3X5 with internal GNSS receiver.These antennas meet specifications in the document Antenna Minimum Performance Specification forGarmin’s GPS/WAAS Receiver System.Table 3-8 GNSS Receiver Antennas[1] Same mounting hole pattern as GA 56, except GA 35 has a physically larger footprint.[2] The GPS antenna connector is a TNC and the VHF connector is BNC.[3] The GPS antenna connector is a TNC connector, the XM connector is TNC, and the VHFconnector is BNC.Model/Description ConnectorType Manufacturer P/N Garmin OrderNumberGA 35, GPS/WAAS [1] TNC Garmin 013-00235-( ) 013-00235-( )Aero Antenna AT575-93G( )-TNCF-000-RG-27-NM N/AGA 36, GPS/WAAS TNC Garmin 013-00244-( ) 013-00244-( )Aero Antenna AT575-126G( )-TNCF-000-RG-27-NM N/AGA 37, GPS/WAAS/XM TNC Garmin 013-00245-( ) 013-00245-( )Aero Antenna AT2300-126G( )-TNCF-000-RG-27-NM N/AA33W, WAAS Antenna TNC Garmin 013-00261-( ) 013-00261-( )Aero Antenna AT575-332G( )-TNCF-000-RG-27-NM N/AGPS/VHF Antenna [2] TNC/BNC Comant CI-2580-200 N/AGPS/VHF Antenna [2] TNC/BNC Comant CI-2728-200 N/AGPS/XM/VHF Antenna [3] TNC/TNC/BNC Comant CI-2580-410 N/AGPS/XM/VHF Antenna [3] TNC/TNC/BNC Comant CI-2728-410 N/AGPS/WAAS Antenna TNC Comant CI-428-200 N/AGPS/XM Antenna TNC/TNC Comant CI-428-410 N/A
