Understand many aesthetic concerns but would be concerned that an in attic installation of the ground wire connecting the lightning rods would permit a lightning stroke to go through your shingles and ply wood , thus setting the roof on fire. Just because one has lightning rods on ones roof does not guarantee that the lightning will actually hit the rods. Lightning standards go back many years (70+) and have been historically based on empirical data that suggests that the "cone of protection" around the rod offers a 1 in 1000 chance that a lightning strike will miss the rod. Having the ground wire on your roof increases the probability of the stroke hitting the grounding system before it hits the roof. All this said, it's still better to have rods then not to have them. All comes down to your risk tolerance.
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