I would start by adjusting the height up & down a few inches at a time to find a sweet spot for FOX. The signal strength should be sufficient according to TV FOOL, but it is not always right. If the small tweaks don't help, you may have to go up 5-10 feet higher or walk the roof to find a better signal for FOX. I am assuming the antenna is on the roof.
If all else fails, you will need a stronger antenna. I would recommended at least a Winegard 7695 for your situation.
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