Yep. Putting on the glare sheild definitely doesn't work. I'm lucky in
the Maule - I have a couple of zippers in the headliner that gives me
access to fuselage tubing. There's a nice crotch that clears the
control cables, it's secure, and get excellent exposure to the sky thru
the fabric covering.

They include an extension cord for the attenna which allows you to mount
it pretty far away from the panel (luggage area). The challenge seems
to be finding a mount that clears obstructions. Throwing it on the
floor in my luggage area didn't work.

Dave wrote:
Apparently, (I do not have one) garmin has a MAGNET in the base of the
antenna (for holding it in place in a vehicle) that they ship with the
396.. (!)

Slight issue with mounting it with velcro on top of your panel.

Some guys are trying to get the magnets out of the base for obvious
reasons, and Garmin dosen't seem to think there is a problem..