...i'm pretty much a "frequent flyer" - never cared much for building, but in 21 years i've logged thousands of flights on 20+ Futaba and Hitec radios at various flying sites in 3 states - i've never crashed a plane due to radio interference and never experienced more than a few intermittent glitches flying glow planes with both AM and FM radios...(the majority of the flying has been in a metro area of around 160,000 population)...

...maybe i've just been lucky - or maybe you have to fly in a large metropolitan area or fly the big gas ignition engines to have a lot of interference problems?...(i know electrics have more interference problems)...