More than likely you won't need a rooftop antenna. Innovative Electronics can show you what you need to do this.
Yes you can, there are quite a few hd antennas that do not require being roof mounted. You will get better overall reception with a higher mounted antenna ,but you don't have to go through the attic. Think about it this way, cable didn't go through the attic, you may have existing wiring you can also reuse. Do some research or consult with a local pro
No
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