Thanks goatnick, yourpost creates some interesting thinking.

A number of years ago using lower frequencies the antennas would have been outside the painted airplane and not shielded by the paint.

I also cannot think of metallic paint generating radio interference. It is quite possible that the interference was from an outside source.

Cnanging to 2.4 Ghz is an entirely different situation.

What is interesting is that you have had no communicaion problem in the last two years with he new 2.4 Ghz system.

I have to guess that your 2.4 antenna(s) is (are) fully inside the metallic paint fuselage.

Could you please confirm that ?

Thanks de Zor