Receive antenna simulation in CST

Hi to all,
I need to simulate the performance of a receive antenna when this is excited by a near-field source. First of all, I hace exported the near-field from another CST MWS simulation. Then I have imported the near-field source in another simulation when I have placed also the receive antenna. I am using the transiet solver with the imported near-field as the excitation source. But know I don't kno how to evaluate the performance of the receive antenna. Any idea or example?
Thanks in advance.

I think it is pretty complex. You should assign a port at the radiating surface of the antenna(that is actually in this case receiving) and then you should plot currents and fields at the feed point of the antenna.