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Because you have a ground rod at the antenna location, you are correct to bond it to the existing electrical service grounding system... 6 AWG is the minimum diameter wire to be used in this case according to the National Electrical Code. If there was no grounding rod at the antenna location, a 10 AWG conductor would be acceptable per the NEC.
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GroundUrMast:
Other than what the NEC calls for, why 6 AWG over 10 AWG, for instance?
6 AWG isn't that much larger in diameter than 10, and both are rated 600 volts. So, why wouldn't 8 or 10 AWG be just as effective?
Thanks again and all the best.....