Gary, it sounds like you may have either a bad cable or just a bad connection. Recheck att the conections and see if it won't clear up. If not you may have to replace a cable. The satelite cable does not go through the vedio box It should run straigh from the dish output to the reciever. If you suspect a bad cable; run a new one from reciever to dish out the door and up to the dish. If that clears it up then you will need to run it permanantly through the roof. Good luck and let us know what you find is the fix.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7