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In general, you'll get the best reception from an unobstructed free-air mounting as high as possible. An attic installation will always operate with a handicap due to the added obstructions from the roof, structure, any outside obstacles, and low height.
A rooftop installation is much more likely to be satisfactory. If vou want to go with a larger antenna, the Antennas Direct DB8e is often recommended, but it's UHF only, and would almost certainly not pick up real channels 2-13. You can add a second VHF-only antenna to pick up VHF high, such as the Antennacraft Y10713. Note that this antenna has a 10'boom, and likely won't be aimable in your attic, even if it fits.
So, larger and more directional antennas, more height, outside the building, clear of obstructions including trees in the direction of the station tower. Those are the general principles. Compromise any of those and, except for unpredcatble local anomalies, performance will suffer.
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