some question about monopole antenna( CST n Hfss) curr

HI all
I want to learn
1) how can i get current distribution with arrows in cst MWS and hfss i am able to get contours
2) mY gain and radiation pattern for any design do not matches for cst and hfss why?
3)what shout be the boundary for airbox ofan antenna of size 30*30*1.6 so as to get matched results in cst and hfss
regards
kartik
any one on line
?

1) HFSS help menu -> Plotting Field Overlays
On the Plot Fields menu, click the field quantity you want to plot.
The available selections depend on the solved solution. For definitions of the usual quantities, see the list under Quantity command.
If you select a scalar field quantity, a scalar surface or volume plot will be created. If you select a vector field quantity, a vector surface or volume plot will be created. If you select a vector quantity, you will be able to specify a Streamline plot. If the quantity you want to plot is not listed, see Named Expression Library.
For projects with Temperature dependent materials, the HFSS or HFSS-IE>Fields>Plot Fields>Other... menus selections include Temperature.
After you select the field quantity to plot, the Create Field Plot dialog box appears.
The Specify Name field shows a name based on the field quantity you selected, and the Quantity list shows the field quantity selected.
4. To specify a name for the plot other than the default, select Specify Name, and then type a new name in the Name text box.
5. Select the solution to plot from the Solution pull-down list.
6. To specify a folder other than the default in which to store the plot, select Specify Folder, and then click a folder in the Plot Folder pull-down list, or type the name you wish to use. Plot folders are listed under Field Overlays in the project tree. Plot folders let you group plots with the same quantity together. All field plots under the same folder share the same color key.
7. Under Intrinsic Variables, select the frequency and phase angle at which the field quantity is evaluated.
8. If desired, you can select a different field quantity to plot from the Quantity list.
9. Select the volume (region) in which the field will be plotted from the In Volume list.
This selection enables you to limit plots to the intersection of a volume with the selected object or objects. You can select and deselect any items in the In Volume list. You can mix model objects with non-model boxes. For example you might want to see a plot from part of two model objects by restricting the region to a non-model box overlapping those parts.
Note
Multiple selection should be used when there is a discontinuous field on a surface. If not, the field on both sides of the surface is plotted and each interferes with the other.
10. If you selected a vector quantity, you can use the checkbox to select Streamline plot. Streamlines are often used to indicate magnetic flux lines, etc. in plots. See Setting Field Plot Attributes for adjusting the streamline display and Setting Fields Reporter Options for setting Streamline defaults.

what is boundary for fan antenna of size 30*30*1.6 in hfss