Between the sti-r and sti-driver. I've had the sti-driver and the k band i thought wasn't as spactacular as i thought it would be. But the k band on the sti-r seems to be the same if not better than the v1. Arn't the antenna's in the sti the same from remote to driver? Also do you think the redline or the v1 crush the bel rx-65 on ka band? I've seen some pretty decent range on the rx-65. Just wondering peoples opinions!