Have you recently purchased a WiFi extender, hoping to boost the WiFi range, only to find the WiFi speed and reliability haven't improved? Here are a few reasons why:
All WiFi routers and extenders have almost the same WiFi range. That is because manufacturers of WiFi routers stick with the internationally allowed maximum WiFi power: 20dBm or 100mw. They comply with the international standard set to protect other devices using the same radio frequency range from WiFi interference. Because of this fixed power, no router is substantially better than any other when it comes to WiFi range.
WiFi extenders do not increase WiFi power, but they may help to cover more distance. Locate WiFi boosters in a place where the WiFi signal is strong enough, yet far enough from the WiFi router to make the best use of this WiFi extension. Typically, that is no more than 10 metres in open space, less if the signal must pass through walls. Often people install WiFi extenders near the limits of their WiFi reception, where the WiFi speed is already low. In that case, WiFi extender will barely increase slow speeds even though WiFi power appears boosted and available at twice the distance. A poor WiFi signal in the area where the WiFi booster is installed may cause regular dropouts of the extended WiFi as well as slow speeds. It might look like you are still connected to the WiFi, but web pages will not be available.
It's irrelevant whether you choose Optus or Telstra or another internet provider. It also doesn't matter how much you pay for your internet service. And buying a new router will not necessarily solve the WiFi range problem either. New routers may sometimes be better simply because the new routers operate on the default settings and have updated firmware. You can achieve the same result with the old router by resetting the router, changing passwords, or updating the firmware.
On the other hand, the latest WiFi communication protocols provided by the latest routers might be more robust, more secure, and more compatible when connecting to your WiFi devices, thus may cause fewer dropouts. Later models supporting the 802.11n WiFi standard may provide a somewhat wider WiFi range, but only if your device supports this standard and if both the computer/mobile and routers are configured to use this standard.
From my experience 802.11n and particularly 5G routers are rarely better and often even worse, as connectivity degrades with poor device compatibility and when passing through walls. The WiFi signal simply does not penetrate through reinforced concrete regardless of the communication standard because all WiFi uses the same high-frequency range. The latest so-called 5G routers using 5 GHz frequency don't penetrate through walls as well, due to less diffraction on the shorter wavelength. The connection through walls is more likely to be a reflected signal through the door or a window. Having said this, in open space and with close distances, 5G indeed is faster than 2.4GHz WiFi.