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I had to replace my old reliable buffalo router and thought the Archer c5400 would be the best solution for what I was looking for including tri band and great coverage.
So far, I'm happy with the router and all the features I was looking for except for the signal strength.
Yes, the house is medium size and there are wall but the signal strength is similar to was getting with my old router.
Downstairs near the router, I get great signal but not upstairs far away from the router. 2.4 GHZ get about 2 bars and the 5 GHZ get abut one bar.
The router can't be placed anywhere else except for the location where the cable modem is located and I can't run cables t upstairs (long story).

Anything else can be done to have a better signal and coverage? or do I need to get Wifi extenders? but even with these, I don't have anyway to have a hard wired connection upstairs and using an extender with wifi connection might not get a strong signal.

Any hints is much appreciated.

Cheers