I am running 3 HD wireless cameras with no problem at 2.4Ghz band.
What I did was install a second wifi access point just for the cameras to connect to so it does not tied up my primary wifi access point which is use for everything else like laptops, tablets, game consoles, or media players. For those I use 5Ghz band whenever possible but older devices like tablet and smartphone, I use 2.4 Ghz band which is on a different channel and SSDI.
It works fine for me even I am streaming all 3 all the time to one of my media players so I can quickly switch and view my camera when someone is at the door.
Bill
