Sorry to hear that you are having trouble.
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The antenna was installed by a firm out of southern NH that does many installations ... they recommended and installed the 8-bay Channel Master antenna and a pre-amp.
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The antenna that they installed is appropriate for your reception, if it is the CM4228HD. What is the model of the preamp?
The DB8e and the 91XG would also be suitable, but I'm not convinced they would do any better. If you want to take a gamble with no guarantee of improvement, try the 91XG up higher.
I don't think it is the wrong antenna; it's the wrong location for the antenna.
How is the reception when the antenna is connected to just one TV without splitting?
Can you show us some photos of what the antenna "sees" when aimed at 221 degrees magnetic?
Sometimes it isn't possible to improve reception beyond a certain point without heroic efforts.