I would try
1. Raising/lowering the antenna 6-12 inches at it's present location.
2. Walk the roof to find a better spot if no improvement above.
3. Add a Winegard 8700 pre-amp if no improvement above.
4. Replace the ANT-751 with a Winegard 7694 if all else fails.
You are right on the edge of what the ANT-751 can do on it's own from my experience. The 7694 is about 10-20% stronger.
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