@mikeslr / @wizard :-
TBH, guys, if that was me I wouldn't bother with all that farting-around with wireless. I'd just run an Ethernet cable down into the basement & call it a done job! Way more stable, too... 
Probably the easiest way of doing this - I can never remember what they're called - is to use a pair of those adapters with Ethernet ports that let you use the existing mains "power" ring circuit as a way to run Ethernet anywhere you want it......anywhere there's a wall socket, you can have Ethernet.
You plug one of the two adapters into the wall socket closest to your main router, and run a short RJ45 from the router down to it. The other one, you plug into any other wall socket in the property (wherever you need a connection). Then run another RJ45 from the second adapter & plug t'other end into your computer. Job done.
Saves having to install new cables (for the lazy amongst us)!
You're just making use of the wiring that already exists from when the property was built.....
(I don't have any idea of the kind of data rates / speeds available by this method. Never used them myself, but a lot of folks seem to recommend them.)
(*shrug...*)
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[ ......later:- ]
EDIT:- 'Kay, here's a link. These are the gadgets I'm talking about ('Powerline adapters', they're called):-
https://www.amazon.co.uk/ethernet-plug- ... all+socket
Look for whatever's in your price range; there's everything there from "budget" through to "very expensive" (but they all do basically the same thing). 
Mike. 