Vertical electric dipole design

Dear Altruist,

I want to know the some steps to design the following model in Feko-

A λ / 40 -dipole is placed vertically at a height of h = 4λ above an infinite electric ground plane. Explore the pattern of this arrangement with FEKO using a perfect infinite ground plane. Use thin wire segments and an operating frequency of f0 = 500 MHz. Provide plots with the FEKO output. 

Here how to place a dipole at a height of h = 4λ above an infinite electric ground plane?

Here thin wire segment means what?

To observe the pattern nulls well, how can I increase the number of samples in the elevation pattern when requesting the far field from FEKO. 

Your response will be highly appreciated.

Thank you.