Thanks again, GroundUrMast
I currently do have the coaxial cable connected to a grounding block outside, and a copper ground wire about 20" long runs directly down to a metal stake in the ground. It's the same stake the cable company used. Perhaps a new grounding block would help, as it's the same one I put in 20 years ago.
Where the electrical meter is there is no stake outside. The house wiring is mostly "knob and tube," but in superb shape- with no additions of aluminum- so originally the electrical sockets were 2-prong and now many have been replaced with the ones with the ground socket- it was an electrician that did it so I don't know how he grounded it. The electrical ground in my house may in fact be to the plumbing inside.
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