@woozle Hi - I've attached an image of the product I'm talking about. I can confirm after a quick google that it is a power line. does that affect my problem? Does this differ from a wifi extender? I...

I've had the AV600 extender for a while which is connected in my shed (back office). WIFI speeds at home always average around 300-500mbps but the back of the house would get a max of 20mbs which...