modal or terminal? Strangeness in HFSS!

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motorway

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Hello,
can you help with design of this antenna. Which solution I must use - modal or terminal?
I see that in HFSS 10 guide there was a terminal solution! Why it gives to me s11= 0 db? I calculate
with big accuracy and big box.

Must I do the coaxial with 3 tubes how in HFSS 10 guide or can I do how in file ant0.hfss (see files)
 

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