So I have a rather large house, about 5000 sq ft. My wifi through the house has always been generally not the best by the last decade's standards but over the last 2 years its been to the point of absolute crap. My router is located over my garage in my business office so its already on the top floor. The house has very thick walls, thick concrete foundation, and thick concrete floors. The router I have is the one they gave me from comcast, and I have one cheap netgear or something extender in the middle of my house on the first floor. My biggest issue is the basement because it is where we have our hangout area with a xbox and a 4k tv from streaming, If anyone is down there on the wifi while trying to stream, it buffers a-lot or just downgrades the quality. My regular non-extender wifi does not show up on anything down there and the extender gets 2 bars, on a good day. So what I am trying to get at is more bandwidth and more range. Speed isn't the biggest deal, its got a good speed when you have a good signal. Any help to fix this asap will be greatly appreciated