HFSS virtual object, meshing/seeding

Hi,

I want to define a virtual object around the antenna and do a manual mesh on the virtual object in order to get more accurate results (in hfss).

Can someone tell me how to create a virtual object, what boundary conditions I should use on the virtual object, and what kind of manual seeding should be done on the virtual object ?

Thanks in advance!

The object I am talking about would be inside the air-box, and surround the antenna. What I am trying to do is, define a denser mesh around the antenna (microstrip patch in this case).