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Wood frame and asphalt shingles are usually the least troublesome materials... But radiant barrier and insulating materials containing any type of metal, including metalized film can form barriers to OTA signals.
Any metal HVAC ducts and those made of plastic with wire or other metal supporting parts are going to reflect OTA signals and detune the antenna if they are within a few feet. The situation is worse when the metal is in front of the antenna, but even to the side or behind you can expect a negative interaction with the antenna.
A few panel antennas offer some support of H-VHF reception (the Channel Master CM-4228HD is an example), but the majority should be considered UHF only.
Given that you had success outside, clear of the HVAC ducts and other impairments created by the attic & roof construction, I would suggest you 'test' again... An outdoor install beats an attic install just about every time.
If you are committed to the attic install for whatever reason, you'll need to locate the antenna so that no metal is in front of it, including vent pipes, gas appliance flues, ducts, insulating products, etc.
Finally, you may need to add a H-VHF antenna or, replace the UHF only with a combination UHF/H-VHF antenna.
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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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