There are a couple of ways you can use aluminum foil to boost your Wi-Fi signal at home. You can create a “wall” behind your router using a sheet of aluminum foil. This works to stop your wireless signal from seeping into areas where you don’t need it, thereby strengthening the signal in the areas where you do need it.
Or, you can wrap aluminum foil around the base of the antennas on your router. Make sure not to cover the tops of the antenna and don’t go overboard with the foil! You can either turn the antennas towards the area you want the Wi-Fi signal or keep them pointed up and make sure your router is placed centrally. The foil works to contain the signal at the base of the antenna and transfer it in the direction the antennas are pointing, strengthening the signal.