Coax is coax. Doesn't matter where it is the problems are always the same. loose connection, bad connections or bad wiring. Find the wire and look for a screw through the cable, Look at each connection and look for clean copper center conductor making good contact when connected. Rarely happens but you could have a bad splitter where one wire is connected to two. If you have a switch from cable to TV antenna look there. Ask the former owner if you bought it directly if they had a problem.
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