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From a completely theoretical perspective, channels 1 and 6 and 6 and 11 do not overlap. There is 25MHz of space between the channels and even with DSSS only 22MHz of that space (11MHz on each side) will be used. However, as a poster said, they can cause problems if there is too much power. That would have to be two devices really close at a decent transmit power.

The reality is that even though there can be some overlap, in real life you may lose 1Mbps of throughput, even in a close quarters lab environment. As always, channels 1, 6, and 11 are the way to go.

Gene