Oh yair, I knew in my heart that I probably needed the upstairs access point, which is why I bought a cheap RT-AX58U soon after we moved into this house a few months ago. It's a credit to the RT-AC86U that the internet was borderline usable in that room without using the access point!The signal from a router (up to 1W) may reach your client somehow, but how is your client (under 50mW) is going to reply back to the router? You have to use more APs. There is no other way to get better Wi-Fi through brick walls and concrete floors.
Once my WAN connection gets upgraded from 100/40 VDSL2+ to fibre in the new year I will get a bit of cabling done for better, er, access to the access point.
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