In my neighbourhood there are:

• 11 wifi signals on channel 1
• 2 wifi signals on channel 4 (including mine at the mo)
• 8 on channel 6
• 6 on channel 11

According to the diagram on wikipedia Mine on channel 4 will suffer interference from channel 1 and channel 6, so a total of 20 other networks(!).

So would I be better to join channel 11, even though my network is then in direct competition with the 6 others?

I suppose the question is: what's worse: direct interference (meaning that on the same channel) from 6 or fringe interference from many more networks?