Tracy, if I was you, I would get a high gain splitter and split the coax from the loop-out and hook both the C and ku on the Uniden up and see if it will work like that. I think it will, and I see no reason for it not to. That way you won't have to switch the coax back and forth on the back of the Uniden, when you're watching analog C or ku. Just a thought and it might not work.
Al
Edit: also, I would be interested to know if it will pick up the other band from whichever you have tuned in on the Fortec. I know it would if you wired it as in the diagram I showed you in the earlier post, but if you do it like this, I think it will only get the band the Fortec is on, just like it will only get the polarity. But, if the loop-out is a passthrough (and I think it is), it should work.