You will find any cracks in the shield with digital on the sub band. For sure...MSO that I was working for down on the coast had digital and HD compressed on channel 95 and 97. Man, I caught hell when it got cold and windy. The the shield would open up and twenty or so channels would be gone. But what really sucked was 80% of the plant was MC2 cable that had been hanging up there for twenty years. Hope you have a good tight plant. Good luck. I was splicing and replacing cable daily, sometimes.
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