I would advise describing in greater detail what you are asking for and some design requirements. To get valuable responses, you must first post valuable information. Hopefully from there, someone on the forums can assist in gernal antenna design questions.
Your design will likely take place primarily outside of LabVIEW. Have you seen software like this: http://www.eznec.com/ ?
You'll need to figure out quite a bit more than the software. What style of antenna are you planning to build? What frequencies do you want to see? Etc.
