Why network card in monitor mode cannot see everything?

[judy]

I was hoping that when I put my wireless network card in monitor mode, I will be able to sniff everything in my WLAN. But I was surprised to see that I can only sniff prob requests from other devices connected to the same AP as my laptop. Even though I have disabled any sort of encryption. Even when I disconnect and reconnect my android, I cannot see the association request.

Does this has to do with channels and frequencies??

[my68_]

no, it has to do how network packs are routed in your network.