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You appear to have no exposed power lines, they are in conduit (called a raceway by the NEC). So you are free to run the down-lead closer to the power. [NEC 810.18(A)]
Mount a grounding block near the electrical service ground-wire (perhaps below the cable company / phone company box. use a new split-bolt connector to clamp your #10 AWG copper grounding wire to the existing heavy copper wire going to the ground rod. I see two split-bolt connectors on that existing ground already, don't loosen them or move them. Be sure to clean paint and corrosion off the wire so you get a reliable connection.
You should end up with a short run of #10 AWG from the new split-bolt to the ground-block and a longer run of #10 from the same split-bolt to the antenna mast.
I see no reason to add another ground rod. You can if you like, but if you do, you must run a #6 AWG copper wire from the new rod to the existing. Isolated ground rods can result in larger voltage differences between them and other ground rods if fault current flows in one but not the other. The #6 AWG copper 'bond' is needed to hold the voltage differences to a minimum.
Grounding in your case is straight forward and easy. My biggest concern is that you take steps to prevent rain water from running down a cable then straight though a hole into the wall... Use a drip loop and paint-able outdoor calk/sealant.
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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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Last edited by GroundUrMast; 28-Mar-2013 at 7:34 PM.
Reason: grammar
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