Just unplugging the third TV won't help. But easy solution, go buy a 2 way splitter, replace the current splitter with it. The loss is in the splitter not how many TV's are hooked to it. So a three or four way splitter has just as much loss with 1 TV hooked up as it does 4 TVs hooked up.
Finding where the contractor put the splitter may be the big challenge.
Reorienting the antenna may help. I have heard those that said setting it like a diamond helped on VHF but you are not reporting VHF problems.
You could try calling Winegard and tell the their antenna isn't working, you need a solution you can afford.
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