Within the time that I have spent on this forum (number of years coming back NOT number of hours spent typing), I learned that radio was power transmission. I have never seen it happen, but some have told me that light bulbs can light up within the control panel of a radio stations transmitter.
An antenna is nothing more than a receiver of power. The more powerful the signal the more power received.
Turning that power into something storable????
The more effective this method is, the more holes that will be created in the wifi network. Little places that the signal disappears.