From the article: ''But why stop at network data? The NSA also uses some fairly exotic tools to grab computer video, keyboard strokes, and even audio from inside more difficult-to-reach places by using passive electronic devices that are actually powered by radar. These devices, charged by a specially tuned continuous wave radio signal sent from a portable radar unit (operating at as little as 2W up to as much as 1kW of power in the 1-2GHz range), send back a data stream as a reflected signal, allowing the NSA’s operators to tune in and view what’s happening on a computer screen or even listen to what’s being said in the room as they paint the target with radio frequency energy—as well as giving a relative rough location of devices within a building for the purposes of tracking or targeting.''

I call BS on this one, everybody knows radar cant go through cars/walls. It would be a too big of an equipment to be of any practical use.