Scientists in Germany have demonstrated a startling new form of surveillance: identifying people using nothing more than ordinary WiFi signals. By analyzing how radio waves bounce around a room, researchers can effectively “see” and recognize individuals — even if they are not carrying a device and even if their phone is turned off.
This bounces off of walls, for the most part, so it will do the exact opposite of what you want. It will show you everything inside the house, not everything inside the walls.
I don’t think so. Drywall is fairly transparent to GHz, but I guess depends on if your home is made of sticks or something sturdier. People reflect better, which AFAIK is what this technology is highlighting.
Yeah I was thinking the higher the frequency the less penetration. GHz definite isn’t penetrating through walls too good.