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The coax shield should be grounded at only one point, near the electrical service, before it enters the building. This one connection serves to hold the entire coax network, inside and out, at the voltage level of the electrical service ground. The preamplifier at the antenna will be grounded via the coax shield. The splitter and any other components attached to the coax system will also be held at the voltage level of the electrical service ground.
If a source of fault current is connected to the coax or any component attached to the coax network, it will flow to ground through the coax shield to the grounding block and then to the electrical service ground system via the short #10 AWG jumper. If the fault is due to static buildup, you'll likely never notice anything happening because the amount of current is usually very low. If the fault is due to something like a nail or screw shorting a coax cable and power wire inside a wall, you would expect the circuit breaker of fuse to open, indicating a fault.
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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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