Borrowing an idea from fellow Zenith builder, I've decided to mount my GPS antenna inside the engine bay underneath the fiberglass engine cowl. To do that, today I fabricated a mounting bracket that will attach to the firewall top stiffener. The project was fairly straightforward using extra 0.034" sheet metal and several L-angles to stiffen the platform. I will eventually attach the mount using a pair of AN3 bolts.
GPS mount in progress with nylon-grommeted wire pass through.
Dynon GPS resting on the finished mount.
Final mount location in front of nosegear spring attached to firewall top stiffener.