I have long dreamt about building a portable phased array for this purpose, but additionally using the phase difference between receivers to visualize where the transmission source is.
> When I made the first video and photoshoped my impression of what I thought this would look like, I never imagined it would actually be this close. It's official, our telescope can map the wifi in a building as if it were any other form of light.
DIY radio telescope tuned to 2.4Ghz WiFi, https://www.youtube.com/watch?v=g3LT_b6K0Mc
Image of physical building overlaid with RF sources, https://www.facebook.com/thethoughtemporium/posts/2162600763...
> When I made the first video and photoshoped my impression of what I thought this would look like, I never imagined it would actually be this close. It's official, our telescope can map the wifi in a building as if it were any other form of light.