>There may be combined approaches, too, with potential for lowest system cost. This simply violates basic physics. Turning electricity into radio waves only to

>There may be combined approaches, too, with potential for lowest system cost. This simply violates basic physics. Turning electricity into radio waves only to turn them back into electricity is always going to lose energy. This is fundamental. In a simplistic undergrad setting the absolute best you could hope for is zero loss, but there is no gain. In the real world with real materials there will be loss. >Here is a patent from an Israeli company on this topic, Patents are granted on all sorts of nonsense. Having a patent is not proof of usefulness, or efficiency, or marketability, or even if it is better than any other competitor. A patent means the material seemed novel enough to the patent inspector that after repeated rounds of claim modifications and paperwork he wan convinced the claimed item is new. Usually patents are on a small piece of a technology, since it, like this one, builds on a lot of pieces coming before it (hence all the other patents cited).