Is it feasible that this 777 may have avoided radar detection by staying low to the ground?
For an a/c at 1000ft AGL, a radar at sea level has a theoretical range of under 40nm. In reality this would be even worse assuming there is a direct line of sight.
OK, I know the 1st thing someone will point out - it was night time, so how could it do any low level VFR?
Assuming this thing followed a predetermined track, isn't it possible that (in theory) whoever planned this out had a means of knowing the MSA for each part of the new route and kept the aircraft fairly low to the ground thereby evading radar detection for the last few hours? Even a set of night-vision goggles could be enough for manual low level flying.
I know this sounds very Hollywood-esque and in true pprune style, but we already know that whoever flew this plane after it disappeared tried pretty hard to make it disappear for a reason no one can explain so far.
Feel free to poke holes in my theory. I'm just speculating like everyone else and trying to give a plausible solution to the dilemma of the a/c not being detected by radar if it flew North after it vanished.