RCS calculation for a bottle in Hfss

Can i calculate the RCS of an object with a planar wave in Hfss?
I want to obtain it with using Iwavephi from 0 to 360 degrees.
To change it from horizontal and vertical propagation should i only change E0 vector direction?
Thanks

You should use inc wave and use spherical definition where you can set multiple angles.
In fra field plot choose rfs vs iwavephi . Be aware that maybe the default is phi