I had the same problem with poor WiFi signal in the shop. I had a range extender plugged into the outlet on the wall closest to the house, but it would only receive a 2.4 GHz signal from the router in the house basement. Total distance was maybe 30 or 40 feet, but a couple of walls , the driveway, etc. in between. I upgraded to an expensive/more powerful router, but this didn't really help at all.
This did. After a ton of comparison shopping and reading reviews, this was the cheapest mesh network that performs well and doesn't have gaping security holes. "Gaming Edition" just because it's the same as the standard edition but lower cost for some reason. I now have ZERO connection or speed issues, and both 2.4 GHz and 5 GHz signals reach the shop just fine. Mesh networks bounce point to point, so you can buy as many extenders as you want and daisy chain them around your whole property. All you need is an outlet. To get to the shop at my place now, for instance, the main router (which is tiny) sits in the same spot as the old one, in the basement. The first antenna plugs into an outlet upstairs in the middle of the wall that faces the shop. The second antenna is in the shop at the same location as the old range extender. Getting the two latter pieces of hardware to connect to each other and work is as simple as plugging them in.
I find that not only is the signal better in the shop, but I now have great coverage outside in the backyard, and the coverage in the house is way better, too. There's crappy cellular coverage at my place, so this is a major quality of life improvement when it comes to WiFi calling.
Anyway, it's rare that a product exceeds expectations by actually doing what it says it's supposed to do, but this is definitely one of those cases. And the cost is low enough that it's not worth spending an afternoon pulling and terminating CAT-6.
I'm going to call up AmpliFi and demand royalties...