CST best mesh ?

Hi everybody I 'm new to CST and would appreciate some help. My problem is very simple. I am trying to model wire antennas. I have therefore chosen the Antenna [Wire] model template.
and i want to knwo is there a typical or minimum number of cells of mesh ?

Any help/advice will be appreciated.

Obviously accuracy of simulation is directly dependent of mesh but as you mentioned that you are new so in the beginning I would suggest that you can live with the mesh generated by CST.
The best way is to generate one mesh get results and then see how accurate they are and then go for more refinement if needed since you are using CST template so right now there is no need to be worried about mesh