WiFi routers emits rays which can be easily reflected by a simple household aluminum foil, which are used to cover food stuffs.This way you can save up on buying a new better router or buying a WiFi range extender.All you have to do is get a piece of Rectangular or Cylindrical piece of aluminum foil and put just behind the antennae of the router, now the aluminum foil will reflect the rays to which ever part it is facing increasing the range of the WiFi in that direction.
WiFi signals cannot pass through the aluminum foil, hence they get reflected and it leads to this phenomenon.
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