[ultimate]

I tried to change my router channel, moved from ch 4 to 8, but failed completely, my laptop couldn't detect the router, I changed back to ch4 and was ok, then I went down the list from 1 to 13, and found 6 channels not working. I tried another router and found the same channels not working, that led me to conclude that there are interference on these "bad" channels.

My question is: do you guys out there have similar problems with channels?

and, what can I use to determine there are interference on these bad channels?

Thanks