There should be no cause for harm to the preamps.
The question is, will the signals from each source combine positively or negatively. Typically, you'll get both, that is, some signals will improve at the TV and others may be made worse.
A 2-way splitter/combiner is cheap... I expect the cost of that part is all you're risking.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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