Setting up a new AP in a rural area. There is almost no 2.4GHz and no 5.8Ghz equipment in that area, i.e. virgin air ready to be seduced 
Hardware:
RB433AH
2 XR5 (sectors)
1 R52H (uplink)
2 Airmax 120` dual pol sectors (only using vert.pol)
On the tower, there are only a Horiz.Pol grid as uplink on 5.8GHz-turbo freq.=5210
and then the 2 Airmax sectors, each with Vert.Pol and XR5 card freq=5700 & 5500
Only 4 clients so far, 2 nanostation5 and 2 Acconet CPE with RB411 with R52H cards.
I can only use some frequencies, it seems like ‘rounded’ numbers work more reliably, ig. 5500, 5600, etc. On most frequencies, clients just does not want to connect but there are no other signal in the area, clean on scan & freq.usage. Some frequencies work, others not and bandwidth test vary quite significantly between the ones that do work. On some frequencies only the R52H connect and not the NS. All devices country setting set to South Africa.
Am I missing something?
Ekkas