The fuselage is basically a Faraday cage, blocking out most radio signals. In the back, the windows are portals for EMF. Up front, the windshield blocks RF due to deposited gold or other metals in the heating elements leaving only the side windows. The small RF passageway combined with all of the EMF noise from instruments, inverters, fans etc makes for a pretty tough operating environment for a handheld. When the aircraft is powered, good luck with VHF band signals.
Best signal to noise ratio is when you are all dark in there.
