Garmin Aera 760 Pilot's Manual page 215

Appendix D
aera 760 Bare Wire Connections to GDL 39
aera 760 Bare Wire Connections to GDL 39R
NOTE: External GPS antenna not required on either GDL 39 or GDL 39R when
connected to aera 760.
NOTE: External UAT antenna should be mounted on bottom of aircraft with 1
meter separation from COM and XPDR antennas.
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190-02674-00 Rev. B Garmin aera 760 Pilot's Guide