I noticed my ground connection outside was cut, so I reconnected it and saw an improvement to the TV signal.
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Your cable TV signal will be improved if it is properly grounded. This means the ground cable, usually green, is connected to a ground rod that goes deep into the earth.
A clean TV signal after making a ground connection.
Cable Internet Speed
I was hoping that the cable internet speed would also improve by reconnecting ground. But I saw no improvement in that. I ran a test at speedtest.net.
The download and upload speeds were the same both before and after connecting ground.
The cable internet connection here gave these test results:
9.75 Mb/s download
0.25 Mb/s upload
Conclusion
A proper ground connection improved my TV signal, but not my internet speed.
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