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Many systems run for years ungrounded. Still, I suggest you ground the coax shield. The couple of extra dollars spent, reduces an already low probability of static buildup that could cause damage to a tuner and also protects from the unlikely event of a nail or screw driven though the coax and a power line.
A J-pole, chimney mount or gable mount would be possible options that would permit install on the 'back side' while still letting the antenna 'see' over the roof. Outdoor reception is better than attic in virtually every case.
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