Hi everyone.

I need RBwAP2nD antenna diagram, maybe someone know where I can find one?

You mean the block diagram ?
https://mikrotik.com/product/RBwAP2nD#fndtn-downloads

I think he was asking for this: https://fccid.io/TV7RBWAP2ND/Internal-P ... os-2836763

Actually OP is asking the antenna diagram.
The antenna is very small, we don't make a radiation diagram for it. It's basically spherical.