This seems like a good place for this...
I reckon it's more viable than the Airvolt thing. My buddy and I were working on a house rewire and on the way right before we got to the house (out in the country), we'd pass under a set of high power transmission lines. One day my buddy said, "Hey man, when we get about a block away from those power lines, get your AC voltage detector and turn it on." Sure enough, a block away from them, they set of my AC detector. So I saw this video I posted above a few days before you posted this video and it was the first thing I thought of when I saw your video link.