No, the antenna you have is about as good as it gets. I
Overload won't damage anything, but may compromise reception of some stations. (Usually the weakest ones will be lost or made worse) It's best to stay on the conservative side with one or more strong signals around.
It's all about experimentation. I have found a vertical sweet spot which yields excellent reception of all available stations. Just a few inches up/down on the mast makes a world of difference here.
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