Putting Aluminium Foil Under Your Wi-Fi Router: What It Does and Why Experts Recommend It

“The trick sounds like something from a frugal grandparent: put aluminium foil behind your Wi-Fi router to make the signal stronger. For years, tech experts said don’t bother. Then in 2017, researchers at Dartmouth College ran actual measurements. A curved piece of foil, shaped correctly, pushed signal strength up 50 percent in one direction. The same reflector cut signal bleed into unwanted areas by about 75 percent (a 6 dB drop), according to TechCrunch. The study did not test crumpled foil. It used 3D-printed plastic forms covered in aluminium foil, designed by an algorithm called WiPrint.” So maybe not of real practical use for everyday Wi-Fi users. It may be more useful for those needing actual directional Wi-Fi over longer distances. But as they say, it then also requires proper shaping, not just crinkled foil behind the antennas. See https://indiandefencereview.com/aluminum-foil-wifi-router-signal-boost-hack