3. Powerline needs to be on the same electrical side for best performance. Also, how did you deal with 802.11n's single channel? You can see it at https://en.wikipedia.org/wiki/List_of_WLAN_channels
I have a 100mb/s cable broadband feed into a cable modem that is hardwired into my PC which gives me great speed.
Problem I have is my son's computer is across the house, about 40 feet away and the signal has to potentially pass through three walls.
For years we have survived via a wi-fi receiver on an extension lead from his PC that means he can cut out two of the walls albeit it is still receiving from about 30 feet away.
This gets him about 50mb/s on a good day but its an unstable signal that seems to go up and down and receives a lot of interference from kitchen appliances.
Last week I purchased a powerline adapter kit that takes the signal - theoretically - via the house electrical circuit and out to his PC via a socket to PC ethernet cable and it works but ...... it delivers a speed of about 20mb/s at best. It is a stable reception and without fluctuation but its too weak for what he needs.
My questions are, should he be getting better reception especially via the powerline adapter and, if not, what would you recommend for getting him a better slice of the 100mb/s that I get ?