Are you dense? Of course they wouldn't use a cell phone. This is why I told you to chill out and think for a second.

Cell is an existential example showing how dumb 'but mah metal roof' is as a reason. Communication over a few hundred meters is not hard. It's an absolutely moronic reason to argue again such a thing.

You have to build the machine, and you have to tune the machine with a gun. It's a lot of work and a lot of testing.

The machine can be a gun. Now you're not saying only a sniper can measure the weather, you've changed your argument to 'but they'd have to test it!'. Of course they would test such a thing. Another absolutely thoughtless comment on your part.

Yes, I'm triggered that you would be silly enough to suggest synchronous fire from simultaneous shooters; or worse: drone snipers.

I never said drone, which is significantly harder - you're creating strawman after strawman because you're wrong and you know it.

Look I'll help you out. There's one good argument against such a thing existing, and that's that you might have a hard time finding qualified people to create something that's only practical purpose is political assassination. But the technology for it not existing is not an argument against it.