I got the COM antenna with an 8' antenna wire. The 8' wire limited where I could put the antenna, so I put it directly behind the top of the cockpit. There are a LOT of washers and insulators that make up the attachment. It was pretty difficult to do with only one person!
When running things from back to front in a Sonex, there are NO good place to run the wires, so threading the wire in and around things, and up to the radio, will be an excercise!
COM antenna
From underneath...
Antenna cable in rubber grommet through framing member