I'm trying to set up a roaming wireless network. For this, I have tried to analyze the area of coverage for any external network interference.
I do know that networks can change over time and Wifi signal strength is not completely uniform, but I was able to notice some tendencies ("room X gets almost no networks on channel Y").
However, I also regularly saw something like the following signal pattern, which makes it difficult for me to decide which channel to choose:
In this case, Channel 1 would have the least amount of outside signals, but also the strongest.
Channel 6 has a few different signals in medium strength, maybe fluctuating a bit.
Channel 11 shows quite a lot of external SSIDs, but frequently fluctuating and all are relatively weak.
It's obvious to me that Channel 6 would be the worst choice for an additional network, but I'm not sure if many weak or few strong signals cause the least interference for a new network.
What would be the best channel in this case?