T o d d P a t t i s t wrote:
A new shielded harness was put into my 7AC before I bought
it, and I've had pretty good luck for typical CDAS and CTAF
comm. I found that handheld location was pretty important,
so I don't hold my handheld in my hand :-) I've got a PTT
setup with the handheld in a cradle mounted well forward,
high on the left tubing. I'm debating adding an external
antenna, but the only real comm difficulty I've had seems to
be on the ground in certain orientations.

Are you using an external antenna?