HI,
You can use all systems board that you want or you have availables on your country. For solve problem NLOS I suggest you to use 5GHz band with OFDM modulation and DFS mode.
For solve problem of reflection into the city I suggest you to use directional antenna with dipole in circolar polarization.
For wireless data applications the antenna is heart of the system. If you want more informations don’t esitate to contact me.