hello my dear
this picture of frequency usage !
how we select good channel for my clients ?
note:curve moving increase and reduce (what is the better thing ?
please give me information about pic in down 
thanx
well .. use 2427MHz and let it be
So, channel usage is more important than noise? I’ve made some tests here and found out that noisy channels with few networks are better than clean channels with lots of networks. Am I right?
I personal prefer a balance between noise floor and freq usage.
It all depends, there is no definitive andwer. Just test and see.
noise = some random radio interference on the frequency you are listening on, all unrecognized signal is thrown here
usage = 802.11 frames that can be recognized.
so if you have device that does no understand either of signals - it all will be noise, well, after all, it is noise.
I prefer to use scan.
It give you a better look at whats out there.
Also you can sort by signal strenght, frequency, etc.
I would suggest..
You should try 1 by 1 channel and see which one can provide more high throughput with good ping latency…