Amp? Maybe.
I found that an amp helped on my Sony Bravia in a situation where it should not. The cable run was only 15'-20' - I was running my current setup indoors to make sure it worked before I put it on the mast. I detect several more channels with the amp in place, but some are blank. Some come and go. Seems to make the unamplified channels more solid - less susceptible to break-up from passing cars.
However, YMMV. You should not see an improvement if you have a short cable run. The amp will raise the signal amplitude but the SNR (signal-to-noise ratio) will get slightly worse. I'd guess it depends a lot on your tuner and how it locks in/out stations.
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