Many, if not most splitters and similar form factor devices (like power insertion blocks, UVSJs, etc.) have provision for a ground connection. In some situations it makes sense to use the feature to ground the coax, avoiding the need for a separate grounding block...
For an outdoor mounted antenna, the ideal place to ground the coax is outside, near the electrical service ground, before it enters the building. Fault current (if it ever occurs) is best kept outside the building.
I would think that the power insertion block is going to be mounted indoors, protected from the elements and close to a power outlet. If that's the case, I would not use it to ground the coax.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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