My device not collect "radiant energy", it collect static electricity I just wanted to keep the name given to it by Tesla.
I explain how I built it, the results that I obtained. I hope that someone can improve it and get better results
This is a presentation video with a brief explanation of the operation at the end, follows the full explanation and test results on this Instructable
The collector in aluminium collects the electrons of the air ionized, it work even with the passage of the clouds (if the air is dry), reached a sufficient charge it spark on candle and circulates the current in primary high-voltage of a injection coil, the secondary is connected via a diode and a small condenser, the small instruments notes the achieved energy.