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I just fixed this situation in a house from the 70s. Cable coax lines grounded to a metal hose bib ... which, in the crawl space, switches to PEX about a foot away from the bib.

Cable guy installing high speed internet was all "nope!". I think the previous owners just had crap internet and didn't ever get into why.



The coax shield must be broken somewhere between you and the service provider. "Grounding" a coax to PEX should never make a difference in any way.


I think part of his worry was lightning strike busting their equipment. Unsure about the rest.




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