|This might be useful - shows where the overlaps occur:|
This is why many routers automatic settings usually go for 1, 6 or 11 but they often chose one of these at random if the domestic power goes off and on again.
I would favor a fixed setting on one of these, avoiding that which your nearest neighbor is using, as it is likely to be the strongest signal.
Since this there has been further extension above 11.
There are free programs around which show all the channels if you don't have that facility on-board.
Always pop back and let us know the outcome - thanks