Unless there are factors you haven't told us, you don't need an amp.
If you did need one, you'd be better off moving the one you already have outside to the antenna (use a remote power inserter, Commscope SVPI, or equivalent) or as close to the antenna as possible (shortest cable).
FWIW, putting an amp right at the input of a tuner is usually a waste of an amp. There's only a very small improvement possible with the amp at the wrong end of the coax.
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