Tito, if we are about to collect any energy, this has been done by a collector or receiver as you say. (naturally)
By the way, receiver in what sense? Like a radio one? Aerial-ground connection? and a receiver must be tuned so as to receive.. In what frequency? Shumman? 7,8 Hz? Those are feeble waves and not power trasmiting.. or no? how much power has the Shumann frequency in it? For practicalities 7.8 Hz in electronic setup is way too low, so a harmonic? Another special frequency?
I do not know.. for sure
I have a question for you. How do you convey an idea to someone and expect to find out the specifics, yet he is totally unaware of the concept?
Regarding Tesla Sayings
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I have almost read all Colorado Spring notes.. and some others documents of Tesla including the 1912 interview in NY at the Law office where he discussed his resonators for ground power transmition. No-where Tesla hints at least the generation of energy in those systems. Actually he recognised the loss that may bear.
The only magniffication according Tesla was the Q factor of a coil (reaching ,000 figures) able to receive feeble (and not so feeble) disturbances from the ground - NOTE distirbunces or currents and not EM waves or so - and via a tuned resonator (another Tesla coil) to receive them and in fact enormously magnify them able to extract serious power at that distant point.
In any case, he acknowledges that since the earth is a perfect elastic medium and behaves as a polished inductor of very low losses, the power is being tunneled by the source and not created by resonance. In other words, the Tuned resonator acts like a magnifying glass, covering a great area.
The earth as a Transmiter?
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Perhaps this is the case with a Earthean natural frequency of currents (Teluric?)
http://en.wikipedia.org/wiki/Telluric_current, whereas the whole earth is a transmiter of huge wattage, yet feeble local disturbances until tunned and gathered?)
"Telluric currents can be harnessed to produce a useful low voltage current by means of earth batteries. Such devices were used for telegraph systems in the United States as far back as 1859"
furthermore
"These currents are known to have diurnal characteristics wherein the general direction of flow is towards the sun. [1][2] Telluric currents will move between each half of the terrestrial globe at all times. Telluric currents move equator-ward (daytime) and pole-ward (nighttime). - Wikipedia
The other side of the coin
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Of course, if indeed energy creation was feasible, then the SURPRESSION has done a wonderful job over here, and noone should expect that he may find any original Tesla document directing as to how to reach that free energy state.
So again the plain noob replicator-experimenter (like me) is left with zero or close to it.
And a plus benefit
, resulting from this ambiguous state we are, is that too many merchants have capitalized with their FE devices (actually this is far from truth) and have made big bucks. Any failure for someone to replicate is met with "My mouth is shut due to MIBs" motos and "hints" and "subtleties" should be studied etc
This is not how the knowledge propages for sure
Fortunately, you Tito, do not sell anything... but you can be a time waster, sir!