Get the biggest antenna you can fit into your attic. Reception drops considerably when your antenna has to go through the wood and shingles of your roof, plus its lower than if it were on the roof. That also negates the need to have a signal amplifier.
Stay away from anything Terk, they're poorly performing antennas. Also avoid eBay antennas which claim 120 mile range which is impossible. They're junk plastic antennas made in China and are worth about $5 each.
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