http://forum.mikrotik.com/t/real-pmp-throughput/108260/1
Upgrade your base station radio and antenna, it’s cheap considering the clients number. Always use the best radio and antenna. I used only netmetal+19dbi sector or now is best to use mANTBox 19s.
I have 24 wireless clients and over 50 conected with cable on one mANTBox 19s with speed between 60-75mbps, protocol nstreme.
