Q: Will the 660 function with out a remote GPS antenna?
A: Yes, it will function without an antenna. If you are looking for an external antenna for better GPS reception that can be found here.
Q: Is the aera 660 mount - bare wire the same as my aera 510 mount?
A: No. The bare wire kit for the Garmin aera 510 can be found here.
Q: Can the 660 be coupled to a Dynon 180 and a trutrak II autopilot like the garmin 496 can?
A: Yes, the Garmin aera 660 can be coupled to both the Dynon 180 and the Trutrak II.