Very good, Rick. Sure, it wasn't that there was something defective about the cable ground that could be corrected by changing it, but that the voltage potential beween that ground and the other ground in your system was big enough to cause a current to flow and cause hum/interference. The isolator cut the hum signal without affecting the TV signals.
Incidentally, Dr. Horse mentions a point that seems rather curious, since the claimed 1.5 GHz bandwidth would be adequate for the down-converted satellite signals. Wonder if a problem really would exist.
