While the Raspberry PI 3 has built in WIFI, the antenna is not very good and I only get about 70% signal strength. While this is good enough for most functions it is not enough for Live TV in HD coming from my back end running Next PVR. Now I have an external USB WIFI adapter, it is by ANEWKODI, it is dual band (I am using 2.4 GHz as my modem/router does not do 5.8 GHz). It came with drivers for Windows and Mac but nothing for LibreELEC. Now I can plug it in and the OS will see it as WLAN1 (the build in is WLAN0). And I can connect with it and log in and it works great lots of signal strength. But the CONNECTIONS screen might show 100% at first and then it will only show about 30% but I am still getting strong signals, the display just won't show the proper signal strength reading. The real problem comes if I have to reboot, then the connections get all messed up and at first I have no connection and the adapters may switch names 1 for 0 and 0 for 1. I have to remove the external USB adapter and reboot and start all over. It would be nice if in future versions of the OS there was a way to disable the internal WIFI and tell the PI to just use the external WIFI only and to remember all the settings and login info for the connection like it does with the internal WIFI adapter.
Thank you for a fine product, I have tried other operating systems on the PI 3 and LibreELEC is the best one. Raspbian would not even see the USB WIFI Adapter so I went right back to LibreELEC (used the saved backup to restore the settings and that worked great). 73