GHA 15 Antenna Doubler (Tunnel Mount)
I will be installing a Garmin GHA15 Height Advisor, and based on recommendations in the installation instructions and seeing what other builders have done for their RV-10's, I am planning to install the antenna under the tunnel (below the fuel selector). After determining a suitable location, I 3-D printed a drill template for the doubler plate that I will need to fabricate. The antenna mounting holes were located per the measurements given in the G3X Installation manual, and I then marked additional locations for nutplate attach holes and rivet holes to attach the doubler to the bottom skin 3-D printed doubler laid in place to verify that everything fit within the tunnel as expected Next I took a piece of 1/16" aluminum and cut it to the same size as the doubler template using the bandsaw. After deburring all edges, I used the template to mark the center 1.25" hole and used a hole saw in the drill press to cut it out. Drilling the center hole in the GHA15 antenna double...