Your measured raw signal is too low for a reliable connection. Raw signal at -73 dB is just short of where no connection can be made at all, about-75 dB. Right on top of your Router is typically about -45 dB.
Your measured noise is WAY too high at -86. That suggests you are using a channel that overlaps in a major way with a nearby Router.
MCS index of 1 and NSS of 2 says you can barely make out the difference between the signals on two antennas, and the modulation technique being used is THE most simple one, providing a Transmit rate of only 130 M bits/sec. The potential on this 80 MHz channel is 867 M bits/sec.
Your hardware appears to be working as desgined.
Problems seen include: :
• not enough signal -- the distance computer to router is too great, or too much construction materials intervene.
• too much Noise -- likely from another router on the same channel. There are some ways to move to different channel to dodge this. But you would still have low signal.
Many users assume that the basement or cable-entry point is the ONLY place for their Router. This is not true. Your Router can be moved to anywhere there is a cable-TV cable. It just needs another Cable-TV splitter at the location you choose, or split the label in the basement and install a new leg, just for the Router.
If moving the Router closer is not an option, you may need to consider one of MANY different ways to provide an additional access-point.
