Inexpensively locating friendly (and unfriendly) radio waves

Electrical engineers have devised a low-cost method for passively locating sources of radio waves such as Wi-Fi and cellular communication signals. The technique could lead to inexpensive devices that can find radio wave devices like cellular phones or Wi-Fi emitters and cameras that can capture images using the radio waves already bouncing around the world all around us.

from Top Technology News -- ScienceDaily https://ift.tt/2WA1DZH