Thanks for the tip BUT here we have site A as the server location and is also serving many other locations on WLAN link, ie. we have locations D,E,F and so on with LOS directed to A and are able to communicate to A on WLAN. I think in this situation we cannot make B loacation bridge as root bridge as location A bridge has to be on top of the tree. Also we MUST have an Omni directional antenna at A. Pls suggest what to do. To inform you its a typical banking senario.