Hi Lupin!
Share your experience with all of us. This is forum and you can find here many designers. We can learn from your experience and you can learn from our.
If you are work on UHF, L, S, C, X antennas you are probably use EM simulator. You can compare theory expecting, EM simulation and measurments results in <EM simulators> section.
I learn to use EM software in this moment.
My opinion is optoelectronic telecomunication.
In the far future I'll try to build hybrid optoelectronics/60Ghz microwave link, that's the challenge.
This is reason for my interesting in antennas and EM simulators.