I'm sure what I can say about this, except that it's oddly engaging.
I've been to VLA*, many years ago to do a video for an educational activity, and I don't recall seeing them behave quite this way. Maybe I should've waited until night time.
Tip o' the side lobe to my pal and science nerd Jeri Ryan on Google+.
* Yes, I know the name was recently changed to the Karl G. Jansky Very Large Array, but I'll be honest: I don't like the new name. If they had just called it the Jansky Array that'd be fine. But if the old name was clunky, it had an easy acronym. Now the name is longer and the acronym harder! So to me, it'll always be the VLA. And get off my lawn.