The problem with channel 4 is that it overlaps other channels. Channels 1, 6 and 11 are the pure channels with the remaining ones overlapping each other.
Channel 13 advise removed because of ignorance of the law. Sorry.
That original pic I put up didn't show all the wifi in range. The parabolas had to float up and down to hide/show others. Attached a new pic to show most and even that's not showing all within range.
Only problem is unless he has brand new devices, he'll have to buy all new ones for 5GHz. I live in an apartment and luckily they all use almost the same channel so I set mine to another.
Another simple solution is to get 4 routers (cheap), use one as the main router and 3 as access points all with the same SSID. Turn up the power, set them at 4 corners of your place, drown out all your neighbors and enjoy!
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