Lets say I have a highsite with 3 2.4ghz sector antenna's, each antenna is approx 1 to 2m appart from each other, their frequencies also dont over lap.

Now will 802.11g per antenna, with letsay -30db signal, how many connections can the highsite support with each client using approx 1mbit to 2mbit bandwidth. This is all internal traffic.

HI,
I suggest you to enable DFS on 802.11g, on scan-list you put your frequencies list (2412,2417,2422,etc..). Is the only solution if you want use sectorial antennas.

Regards
Xandor