I was thinking more of roof/wall mounts. Even if the pole is grounded by it's mounting in the ground there will probably be a significant PD across the IF cable in the case of a direct hit.
My wall mounted dish put up by Sky about 4 years ago isn't earthed, and I haven't seen any dishes that are, but that of course doesn't mean that they have been installed correctly with regards to any regulations.
I have never seen an earthed dish .that does not mean there are not any .but the dish is only a reflector so I cant see why an earth would be needed.
I only have experience putting up sky dishes .
Rob T