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A Clever Radio Trick Can Tell If a Drone Is Watching You | WIRED

As flying, camera-wielding machines get ever cheaper and more ubiquitous, inventors of anti-drone technologies are marketing every possible idea for protection from hovering eyes in the sky: Drone-spotting radar . Drone-snagging shotgun shells . Anti-drone lasers, falcons, even drone-downing drones . Now one group of Israeli researchers has developed a new technique for that drone-control arsenalone that can not only detect that a drone is nearby, but determine with surprising precision if it's spying on you, your home, or your high-security facility.