A number of members have asked about schematics and service manuals (for those areas you mentioned) for their Keystone RV's. Unfortunately, the short answer is that there are none available - for any model.
In regards to your other question about the loopback coaxial cable, you might want to post that question in the Technical Corner section of the forum. At the same time, if you use the forum search feature, there are numerous posts and threads about satellite connections and TV already there for you to browse through.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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