|Do you have mismatched MCX and BNC connectors on your navigational device and external antenna? Match them up with Garmin's MCX to BNC adapter cable. Approximately 6" long.|
I already had an external mount antenna for a previous Garmin GPSMAP 496. This is a simple add on to ensure good reception in the cockpit. Easy to attach to the BNC cable and easy to attach to the unit. I tried the Aera 660 without this and it worked well but for peace of mind, and to use the existing equipment this was an easy upgrade.
The Garmin MCX to BNC adapter cable (11-90210) is approximately 6 inches in length.