[John Candle]

The feet marking on the cable shows how many feet , so the numbers can start at 475 and then a bunch of cable is reeled out and the number is 575 , you know how many feet that length of cable is. Unless you are living in a mansion I do not think you have a 475 foot run. It is more likley the cable or connectors or splitters or amplifier is bad. Inside of connectors on the ends of the cable look for the outer foil shied and shield wires pushed in to ward the center wire of the coax , if so , push the foil shield and shield wires away from the center conductor. Also look for a shield wire wrapped around the center conductor. I suggest a L o n g known to be good coax to use as a test jumper. Connect the 'test jumper' at the antenna and 'jump in' at places in the coax system to locate the bad componet or componets. Connect the coax 'test jumper' to the antenna and direct to the Tv , then work through the system to find the problem or problems.