The wifi equipment we use is called Routerboard's and they run the Mikrotik Routerboard Operating system.
The routerboards have a facility called NSTREME that employes some software trickery to clean up the signal and make an adequate signal more usable. We have turned this facility on, on almost all our towers.
This means to following : You cannot connect to our towers with anything other than a routerboard, or a pc running routeros. You MUST have nstreme enabled to connect.
This means youre notebook, Nano's, bullets, and other non RB CPE's will not be able to connect.
You can Buy Roterboards from Digital Dynamix at 501 Cape Road.