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Could this be FM station noise I see on 2.1?
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Possibly. It could also be random RF noise generated inside your "18 dB booster", power lines or a combination of similar sources.
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Would pre-amp be better than amp at the TV set?
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The same amplifier attached at the antenna rather than the at the receiver, will offer a better signal to noise ratio (by up to the dB loss of the cable between the antenna and receiver), provided the amplifier is not overloaded by the higher signal level at the antenna. (Not a likely possibility in your situation.) But your question begs another; How big a pump would you need to get water out of a dry hole?
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What about filters to put on the antenna line?
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Have you identified an interfering signal that needs to be blocked?
To continue the well analogy, you won't get more water unless you dig the well deeper.
IF you can safely mount an antenna higher, TV Fool offers the tools to explore what signals would be available to you.