I would try the attic. Don't commit to a lot of labor and expense running coax permanently until you prove you have reliable results. If the attic is an acceptable site, you'll never need to worry about corrosion or wind damage. (Be prepared to see some signal reduction when the roof has a snow load.)
If the attic is not going to work, the clear and unobstructed view from a wall is a great option for that compact antenna design.
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