Also, sure it might be 37% efficient, but do you realize how SMALL the density of RF energy is? The Friis transmission equation gives you some idea: it decreases by the square of the distance away from the source, due to that power spreading out in a sphere. When you start off with only a couple mW of power and an omnidirectional antenna, there isn't much power left to harvest when these tiny receiving "metamaterial" antennas are even just a few feet from an access point.
"Oh no, a virus has replaced all my Fourier transforms with Laplace transforms!"
You'd be surprised. These types of viruses are spreading at higher frequencies. It's only a matter of time.
Now they want to point some sort of radar at a complicated source of ground clutter that's already difficult to detect and remove? I don't see how that's going to fly (no pun intended).
For more information: http://www.roc.noaa.gov/windfarm/how_turbines_impact_nexrad_user.asp