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The HDP-269 is a pre-amp, so it will be amplifying everything that passes through it. All of your channels will get a boost no matter where they show up on your channel list.
The general rule of thumb is that green channels are very strong and can probably be picked up with an indoor antenna, yellow is getting weaker and will require a bigger antenna in the attic as a minimum, red signals are weak and will need a rooftop antenna with good sensitivity, grey channels are extremely weak and may require extreme measures to try to pull them in.
With an HD7696P on the roof with a pre-amp, you'll probably get most of the channels down into the red zone, but you probably won't get very much into the grey zone. You might get some channels in the grey, but they might come and go depending on the weather.
A bigger antenna like the HD7697P or HD7698P might help improve your chances with the grey channels, but you're mostly talking about channels that are over 80 miles away, and it's extremely rare to get reliable reception from so far away because the curvature of the Earth is getting in the way (you really need to be very high on a mountain to cover that much distance).
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