Radiation pattern mesurement

Dear Sir

I want to measure the Far field radiation pattern of DRA. For this I have been taken two antennas one is transmitter and other is receiver. But I am facing problem with spectrum analyzer. I have been taken data from spectrum analyzer but i am unable to explain that data.

If you turn the DRA 360 degree at a fix point, note down the amplitude from spectrum analyzer at specific angle steps, you'll get the radiation pattern. What data on the spectrum analyser can you not explain?

Thanks for your prompt reply.
I have been taken the data as you told.
but I am facing problems to explain the data because I got data in dBm with negative values and simulated results in dB. So i am unable to understand how compare both of them.

See this thread:

https://www.edaboard.com/thread209007.html

If you just want to compare the pattern, you can just normalise the plots.