Wow, it's like everyone jumps right into HFSS/CST without any prior experience. If I were in that situation, I would definitely need to explain things using MATLAB first. Since you're having this problem, it means you haven't used these software before and are jumping straight into HFSS. That sounds really frustrating. Amateur radio is all about practical application.>Theoretically, MMANA-GAL can solve approximately 90% of amateur radio antenna problems. Once you've addressed the remaining 10%, you will naturally find other software to help you with the more complex issues.