As radio waves are a type of electromagnetic field, they produce an electromagnetic field of radiation, known as EMF radiation. Electromagnetic fields produce electromagnetic field radiation. If you’re interested in wired internet, check out this article on getting wired throughout your house and even to the second story. Before you buy any new equipment, measure your current coverage with a heatmapper so that you know where your problem areas are. See Mapping Your Wireless Network with a
RangeXTD WiFi Booster to get started.
All of this happens at the speed of light, and all of this is completely invisible to the naked eye. While electronic devices are connected to Wi-Fi, both the electronic device and the wireless internet router are emitting radio waves. The repeater/extender simply repeats the signal from the router to create a new network that extends wireless coverage. Wireless internet emits EMF radiation through the wireless internet router as well as the electronic devices that are in communication with the wireless internet router. You can have as many as 15 different devices connected to your home’s wireless internet.
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If your router/gateway supports WPS, press the WPS button on your router/gateway for 5 seconds until the WPS indicator lights/blinks to initiate the connection. By boosting the Wi-Fi signal, you can extend its reach, which sounds like a good thing. However, the frequency band with the longest reaching signals (2.4 GHz) is also the band with the most interference / wireless "noise". Extending your signal further will therefore contribute to even more interference for your neighbors.