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too much amplification
Yep, AD is spot on.
This is why I always try and operate without a preamp first.
Low vhf don't need boosted because losses are far less at those frequencies and high vhf will also do very well without boosting.
TV tuners are barely capable of dealing with the massive amount of rf interference sources today as it is.
Adding a preamp or dist ampthats not needed simply desenses or AGC overloads the tuner.
Remove the preamp and run coax from the antennas straight to the distribution amp for starters
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