Thank you for your post.
With the Intel® My WiFi technology in a perfect environment (no interference) you could achieve up to 8 simultaneous connections. In most environments we have seen about 3-4 devices connected. The more devices you add more connection trouble you may get. It also depends on how the system is designed/integrated.
The broadcast area is based on ad-hoc connection, decreasing the signal is not a feature of this tool.