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The obvious solution is to get the antenna out of the attic.
Your signal power *should* be very strong, but Techshield will have an unmeasured amount of attenuation. Perhaps its only 10 dB on VHF, perhaps its 50+ dB. No one knows for sure.
VHF is HIGHLY susceptible to localized interference from a host of sources that may not be readily apparent. Among these are anything that is solar powered, FM radio stations, electrical and electronics, and power transformers/lines.
If you are indeed encountering some sort of generated interference, then an amplifier will only make it worse.
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