Hallelujah! I found a great improvement. I dug out and added an ASUS USB-AC56 antenna/amplifier(?) on my laptop and desktop.
Laptop is closer to the router so it got some extra speed. But the desktop, holy signal strength! I can actually use wireless internet!
Guestimates: Router to laptop about 30' and 2 walls in the way, Router to desktop 50' and 2 walls, one is an outside block wall.
Salvation on a "stick".
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