Quote:
If it were me, I would mount an RCA ANT751 outside.
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That is still my position.
The attic is an unpredictable reception environment. The Lava antenna continues to earn no respect. Amplified noise and distortion is just loud noise and distortion. I don't know how to say this more emphatically...
You do not need ANY amplifier, AT ALL. That your situation seems to be improved by one implies there is a problem elsewhere in your system. The most glaring problems are the Lava antenna and the attic mounting location. You are also right to suspect cabling issues. Get rid of unneeded splitters and shorten the cable runs were possible. Be on the lookout for loose or bad connections.
As the leafs come on the trees, signal levels are going to drop, and multipath routes will change. You can overcome much of that by avoiding the attenuation and reflections caused by your roof and attic materials.
I would not be shouting this at you if I were in person, just a determined, confident tone.