[John Candle]

I also recommend grounding the coax in the attic , use a coax grounding block. Most houses will have a BARE copper ground wire running along with the other electric wiring , can use a split bolt clap to connect a wire from the coax grounding block. The electrical hardware department of Home Depot and Lowes will have all manner ground wire and connecting hard ware. . So why ground the coax in the attic?? Grounding the outer shield of the coax directs interference to ground thereby providing a cleaner signal to the Tv's.