Lining my walls with aluminum foil is not an option
:twisted: One more specimen for sampling, Subcommander. :twisted:
Start with a site scan and determine the channels the nearby networks are using. If they are NOT using one of the primary channels (1, 6, or 11), use that.
If they are present on all 3 channels, select the channel where the other networks are the weakest in signal strength in every place you have wireless devices (router, access points, computers, game consoles, etc.)