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New info... new suggestion
Given that the coax enters the house on the opposite end from the electrical service, you may well find it best to add a new ground rod near the coax entrance point. Bond the new rod to the existing ground rod with #6, then it is a part of your electrical service ground. That allows you to keep the mast ground isolated from the coax ground until they meet at the electrical service ground connection.
If the coax ground block is more than 10' (wire length) from the connection to the electrical service ground, you have the possibility that a large fault current would cause a large voltage to appear on the coax due to the voltage drop in the long grounding wire (between the grounding block and electrical service connection point). The situation is worse if the mast is hit, and the ground block is sharing the same ground wire.
The mast ground should not serve the coax ground block. The coax ground block should be located close to the electrical service ground and use it's own short length of #10 wire to connect the the electrical service ground.
If you want to put it in conduit, that's your choice.
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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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