Not necessarily Wi-Fi related, but I'm using these for my TV/streaming devices now- they extend your network over your electrical lines. I've found that we lose a little bit of mbps (our old condo wiring might account for that) but the consistency is like night and day. If you have the option to use an ethernet cable I would recommend giving these a shot, especially for that basement TV.
https://www.amazon.com/gp/product/B00UVN4318/ref=oh_aui_detailpage_o07_s01?ie=UTF8&psc=1