AFAIK the channels overlap a bit so moving 2 channels away makes sure you dont move into the next one suffering the same interference.
Further reading
here
Quote:
Channels: If you do add more than one base station to your home, make sure to set them up on separate channels. Two base stations on the same channel can interfere with each other †“ drastically reducing the performance and range of your network. But it's not like TV †“ wireless networking channels overlap each other. To be safe, stick to channels 1,6 and 11. They are guaranteed not to stomp on each other.
Channel Overlap: Even if you only have a single base station at home, you still may run into channel conflicts with your neighbors. Since most base stations are configured out of the box to run on channel 6, sticking with the defaults could cause trouble. If you live in an apartment, condo or closely-spaced housing development with tech-savvy neighbors, check for other networks before installing your own.
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