For now I will let it run as is with gain lowered approx 14dB (from the Max Gain of approx 55dB).
BTW, how good is the preamp stage (transistor?) inside the FlightFeeder? Great one or just good enough?
As an experiment I might add a good preamp in front of the FF+1090 Filter and then lower even more the gain of FF (to match the introduced gain)… to the purpose of lowering the total noise factor. Of course, it is the risk that amplified signal might overload the input and make things worse.