I think we could make a few simple assumptions here, first the Hendershot device must extract energy from somewhere if it worked as claimed. Second if his device worked as claimed then there is some process operating which we do not understand. In which case it seems logical that we should examine the basic premise of how energy can be extracted from ambient forms of energy or man-made sources at a distance.
It may be that if we could develop a device to extract tangible amounts of energy from a power line at a distance then we would basically have a wireless means of power transmission. The boys at MIT have been working on this however they are using a very specific setup. Now if we could develop better ways to extract EM energy from a power line which is not completely dissimilar from what the boys at MIT are doing then it seems logical this could apply to ambient sources in some way.
I'm not suggesting stealing power I'm speaking about a better way to extract energy which we may consider ambient energy, low energy sources covering a large area.
I mean no offense but all of your posts revolve around why everything cannot work and you seem to be implying that nothing can ever work in my opinion. To me this is pointless because you are not part of any solution to producing a real device which works. Maybe we should try something different, rather than constantly telling us what cannot work how about telling us how this device could work, hypothetically speaking of course, do you have any ideas?.