Sky hubs have a pretty shocking rep to be fair so not a good place to start. Another common but lesser known source of wifi interference are LED lights on a standard dimmer switch. Change your dimmer switches to zano dimmers and it should fix it. (Obviously, run a speed test with any suspect lights on, and then off to see if there's a problem here)
You set this up by installing the requisite app which is in English. It works really well. If used with xiaomi router, the router has a brilliant function of being able to control the signal threshold at which a device is kicked off the hub wifi, this is so that it will connect to the nearest booster when you want it to, instead of when your device decides to. Language is a faff, for advanced function configuration i advise logging into the router using chrome on a PC. Chrome's auto-translate feature is a good workaround
Anyone know if this can be used with a mobile power bank to boast my drones WiFi.
Agreed . I'm tech support for a broadband provider and amount of people complaining that there wifi is rubbish and they cant use their fancy sonos and they can't use there smart TV that costs so much money... your using a free router. £300 for beez neeez router ain't that bad when you got 3 k of gear using it.
Power line adaptors are okay, but remember they depend on the quality of the electricity/power lines in your house. If you have crappy wiring, power lines will continue to deliver poor broadband. Also bad example with these repeaters and I agree with what you said about the power levels, but remember there's a lot of software that sit behind these devices that can (and do) make a difference. If broadband and the speed of WiFi is crucial to you, do it properly. Hard wire everything that doesn't tend to move (like TVs or game consoles). Invest in a decent set to access points or whole home WiFi system like BT Whole Home WiFi or Ubuiquiti etc. It'll definitely be more expensive, but given the amount of kit that the average house has that depends on a stable internet connection, it's totally worth it.