How To See Through Walls For Under $20! (Wi-Fi Vision)

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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.
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