[Timmmmbob]

Yeah it actually makes sense from a physics point of view. All the fancy reflective angles on the stealth plane won't do anything if the wave is longer than they are. "Small" things all look the same in terms of wave reflections.

The radar-absorbing paint may do something (or at least it could in theory). And long-wave radars are naturally going to bigger and more inconvenient than short-wave.

I've never really thought about it, but I think he might be right!