An amp would help push the signal strength back up if you split it to the point that reception is impacted; cable length, splitters, etc all contribute to weakening the signal. It won't help your antenna do any better than its design. In other words, a noisy signal would be amplified as a noisy signal. So the best best is to get the best antenna for the job, delivering the best signal possible. I always suggest saving an amp for later, if you need it, after you've got the antenna dialed in.
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