Wireless Setup about 3KM

Hi,

I have a running local ISP of about 150 clients, using Mk 3.11 as my Server. I am thinking to switch to wireless. The maximum area that is being covered is about 3KM radius. I have no prioir knowledge of wireless, also would like if any one can suggest some basic docs that i can go through to get the basic about wireless, how it works.

Also would like to know what will be the main equipment that i will require in starting WISP.

Looking forward for a positive reply.

Come back once you have read http://wiki.mikrotik.com/