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Is my internal splitter grounding to the nearest receptacle (the bottom pic) helping?
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Is the frame of the receptacle connected to the electrical service ground? I have to ask... the previous owner here failed to connect any ground wire to several of the receptacles they installed.
If you're actually connected to a #12 or #14 AWG 'equipment grounding conductor', you should have protection from contact with power. Ie. you could hope to trip a 15, 20 or even 30 Amp breaker if the coax came in contact with a branch circuit. And you would expect that this would drain static off the antenna system.
Grounding your mast would add quite a bit more protection from nearby lightning strikes. I prefer to offer lightning induced current a low impedance path to ground,
outside the building. If your splitter is solidly connected to the electrical system ground, you've got a situation that leads fault current into and through your home.