I'm planning the mounting of a node with 4x90º sector antennas. My first idea is use a RB532Ar5 with RB502 and four R52 cards.

Are there known problems with this configuration?

Another question. Now I'm using Gigabyte GN-WI01HT with IkarusOS, so I have an important stock of these cards. Over the paper seems a lot to R52... has someboby tried it with mikrotik?

I haven't tried it, but from the specifications that seems to work. The thing to make sure of is that you don't overload the power supply of the RB532, which I do not belive will be a problem when using R52 cards.