I can't say I've tried the hairpin specifically although I've had plenty of fun with a Tesla coils.

Tesla coils aside, building well tried and tested things that have been repeated many times isn't really my goal unless part of something else.
My Interest is probing those fudged mystery area's whilst trying to work out how to engineer the effect you refer to as 'radiant energy' Over the years because of this forum I have witnessed radiant energy many times (as many seem to have at some point) .. even the simple antenna system I show above above has now charged a small cell phone battery.
I wish to know more about the effect by building and experimenting .. That is to be more specific David .. spending my money and investing my time to build things I wish to, as opposed to building things others suggest I should. Still interesting effects I find, I report and share. That's what forum's are for isn't it?
like all experiments my series starts with a hypothesis which is pretty much spelled out here for comment. At the moment I am building simple equipment to heterodyne a lead acid battery to test part of theory. Of course I don't know if it will eventually work (or not) or else I would not have to build the thing!
My bumbling efforts and considerations aside David if you have built another stable, tried, tested, and more importantly 'dependable' system that's a vast improvement on the antenna single wire system I've started with 'pray do tell' It could well save weeks and weeks of what might be pointless effort. If the hairpin circuit is part of that theory you can bet your bottom dollar I'll build it then!
In the mean time I've posted the hypothesis I'm trying to test for consideration. so I'll continue having fun building ,tinkering, testing,learning and experimenting with this simplest of all single wire systems that is gathering 'ambient power'
Kind regards Duncan




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