>The second is called OVERHEAD, which uses U.S. government satellites orbiting above targeted countries to locate and monitor wireless communications on the gro

>The second is called OVERHEAD, which uses U.S. government satellites orbiting above targeted countries to locate and monitor wireless communications on the ground below — such as cellphone calls and even WiFi traffic. Is this really the case/possible? I know low power transmissions can go a long way, but seems insane to me that you could pick up meaningful cell/wifi traffic.