During the build I added carbon fiber material in the tail, nose and mid fuselage. Together with the original carbon fiber strips reinforcements I was worried I created a radio signal challenged environment for the receiver and antennas. I'm far from being an RF guy so I did some homework and consulted with a very good friend with experience in this field. The result was getting one of the antennas out of the fuselage while the other is facing up through the cockpit floor. This configuration was tested in taxi tests and range checks before even taking the plane out for test flight.
One of the receiver's antennas is facing up through the cockpit floor.