Station Help all please

Hello,

i have a internet provider setup. I have 2 sectors , 1 Grid and 1 CPE. Now we are covering 3 km. At client end we are using USB with 12dbi External Antenna.

Now,

I want to setup this professionally. Now i am using a computer with mikrotik and with wireless cards.

Request to all please suggest me equipment and Also tell me with that system how much area i can cover.