You have 2 issues to deal with before trying different antennas.
1. You have channels from all 4 points of the compass to deal with. Any directional antenna will not get them all. Unless you use a rotor.
2. Your antenna is in the attic, that makes it un-predictable at best on how any particular antenna will receive signals.
Also what about any trees between you and the towers, hills, buildings/houses?
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