Hi, thanks for checking in on my post. I'm from Canada.
Main host router is an Actiontec T3200M.
wireless modes: mixed mode 5GHz a,n,ac (it does not support 2.4GHz)
channel is set to "initial channel selection only" and the current channel is 149
40' is an exaggeration I guess. Maybe 25' through one floor (drywall ceiling and wood flooring)