We are deploying are first Mikrotik hotspot in a rural town and are having issues. We are using a Ubiquiti SR2 on a RB532A with a Pac Wireless 2.4 12DBi v-pol omni with 3 degree downtilt. We tested the AP with the antenna at 10FT and it seemed to be working OK. We then installed it on top of a building at a height of about 35' and we get very poor connections everywhere within the down (mile radius). We swapped the hole unit out with another one (mikrotik Hardware and antenna) and same result. The antenna is on a 10FT mast on top of a building with a very slight pitch and is about 5 feet from the front edge. The building has a metal roof. There is a Canopy 2.4 AP about2.5 miles away pointed toward the town but we tried several frequencies and had the same problem. I think we may be overshooting the town. The Beamwidth of the omni is 8 degrees.
Should we switch to a 7 or 9 DBi antenna to significantly increase the beamwidth? Would it be better to run sectors on each edge of the building? Are there any issues with installing multiple SR2s or RB52s on a single Routerboard?