The more metal there is between your WiFi router and the connected device, the worse the WiFi signal will be. What does electricity have to do with WiFi? Radio waves are electromagnetic, meaning that metal has the ability to absorb them.Īnything that has metal, such as metal blinds, doors, furniture, buildings, and walls, can greatly lessen or completely kill WiFi signal. Metal is the hardest material to penetrate because it’s a conductor of electricity. The following list is ranked from worst to least. Signal issues can also be caused by physical objects and radio waves from other devices. Materials that Interfere with Your WiFi Signalīuilding materials are the worst WiFi signal blockers, but they are not the only ones. You can always improve signal to a cellular router by using a signal booster. All of this adds up to bad signal at your router. Anything that blocks the radio waves path or causes electromagnetic interference, will block or weaken the signal. The waves are part of the electromagnetic spectrum. Routers (also known as WiFi access points) wirelessly transmit radio waves to communicate with your wireless devices.

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