I think he meant RBSXT-5nDr2, that thing should be good for 10km, I personally never gave it a try, but by the specifications and by some posts here it seems possible. I would use CPE for this.
Maybe this will help you: http://forum.mikrotik.com/t/routerboard-sxt-what-max-distance-with-max-thr-put/44362/1