Not to imply that your antenna stuff was in any way related...but a scenario my friend went through left us a little baffled a few weeks ago and i thought it was relevant. He's a mechanic on our patrol vehicles and works on them day in and day out, one of the days he was working (he has an iPhone 5 btw), they were installing a new radio antenna behind the area where the car pit is and he was sitting outside working on one of the trucks when they turned it on and started doing whatever calibration work they do to it. After a few minutes he noticed interference with the radio in the truck (not surprising, they pick up everything) and he grabbed his phone and it was completely dead...and like you, he freaked out, but then did a hard restart and it was A-ok.
Weird situation, may have had nothing to do with the antenna at all, but still...aliens.