I would have responded to this sooner, but I somehow missed it.
I had a similar problem and after much trying to solve it, I discovered the diagram and wiring did not match. It proved out that the cable and sat actual installation were backwards. If I hooked the cable up to the sat I got both front and rear. If I hooked the cable up to the cable connection I only got the front. Of course this does not solve the main problem of getting sat in both location, but it is a start.