In addition to the good advice that jref provided there have been cases when a flag pole was hit by lightning andthe 2" of rock at the base was blown around and struck a neighbors car across the street. A proper arrangement would be a lighting protection system that is connected to the flag pole per the lightning standard NFPA-780. Remember lightning is unpredictable and you have no ideal what it will do once it reaches the ground - or your house.
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