Turning my attention to GPS antennas I did some research on where to locate the two GPS antennas. I will have one for the Garmin 430 and one for the Dynon Avionics. I liked the idea of under the front cowl so I did a lot of reading and emails about whether this was a good location given the heat, cover under the fiberglass cowl, proximity to other wires and each other. All signs point to this being a fine location.
So I made a paper platform that is 6 inches X 6 in square which is large enough for both antennas. Also I decided this platform had to be removable.
So I used a hinge along the top and two scews one on each side to fasten it to the firewall.