Yes I can. According to the frequency. Just as I said earlier antenna has to be resonant, actually the whole circuit has to be resonant. To maximize energy pick-up efficiency you usually want to maximize aperture - the area the antenna takes, but must remain resonant. And it should be matched - by adjusting components after the antenna so the energy travels further to the load. The rest of the circuit (Transistor) is power source an it will drive the LED's even without RF. When RF energy is presented it's efficiency improves. The patents likely describe the details. Only it is difficult to comprehend the patents - the English could be better.
: )