Thanks for responding Ken. The package does say "Cat 5/Cat 6 Wall Plate Extender Kit" but I could try another set of cables (I don't have any cat 6 laying around). Let me see what I can find.
The back of the box has more details. It says I need CAT5E-UTP to transmit 1080p. I don't know what that means. I'm going to google it. You might have figured it out. I thought there might be a ground issue.