Isolating the problem
You have a very good signal report for the 5 stations you are interested in. To isolate where the problem is, I would suggest installing a TV at the end of the 75' cable from the antenna without using a splitter:
1. If you are now getting a great picture on that TV, then you will probably need to replace your splitter with a distribution amplifier.
2. If you are still getting a problem picture then you may need to look at getting that antenna out of the attic and out in the open.
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