Camera.RenderToCubemap -how to set farClipPlane ?

hi
im using the Camera.RenderToCubemap script from the manual
https://docs.unity3d.com/ScriptReference/Camera.RenderToCubemap.html

to Make a cubemap it works but the farClipPlane is to low i cannot see the My skydome
complete.

i cannot code so i try to set it with
go.farClipPlane = 100;
in different places in the skript but i have only errors

need help