No, all sources of noise add together... Co-channel interference is continuous and spans the entire spectrum of the broadcast channel, making it more problematic. But random noise from any other source (including amplifiers and receiver front-ends) will contribute to the problem.
If you build in a cushion, you are more likely to be happy with the resulting service... If you build to the bare minimum, expect unreliable reception.
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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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