I think maybe he meant to write "the only thing I knew about antennas was
that they are resonant circuit."
Exactly! Thanks.
I red a tutorial about the analysis modes and understand your point now.
My knowledge about this was, if you have to analyse the frequency response do a AC and if you have to analyse the time response do a tran.
This is totally my fault, that I was ill-informed. I trusted in the words of someone without refering to another source.
