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Here's how to make a device that lets the user detect objects walls! Best of all the build is pretty easy and it can be done for under $20. The device consists of a helical antenna that is build for Wi-Fi frequencies. Wi-Fi passes through walls and this device can detect any wifi source such as the cellphones that everyone carries. So in theory anyone with a cellphone can be tracked through walls with this device.

Satellite Finder: https://amzn.to/3c2JgSX
MIT Wi-Vi: https://people.csail.mit.edu/f....adel/papers/wivi-pap
https://www.youtube.com/watch?v=kBFMsY5ZP0o

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