Welcome to the forum, Marley:
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I want to put up an outside antenna, be mounted at the top of my roof.
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That's a good idea with your weak 2Edge signals that are far away; the curvature of the earth begins to interfere with signals at about 70 miles.
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I am thinking of possibly 2 directional antennas, one pointing NW and the other pointed SE,
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You would need to do that if you want both directions and avoid using a rotator.
That is not easily done because when the same signals from each antenna reach the combining point they will interfere with each other if they are not in phase.
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My goal is bringing in the networks consistently, but maybe I am asking to much. At this point do not want to put up a tower, trying to stay discrete as possible. Also trying to avoid using a rotor.
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Your goals are mutually exclusive because weak poor quality signals require large high gain antennas that are very directional. I suggest you start with a modest approach with a Winegard HD7697P or better yet a 7698 aimed SE with a preamp.
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The antenna is pointed NW, about 330 degrees,
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The antenna needs to be aimed directly at the transmitter for best reception.
With your weak signals in many directions, a CATV system would need something like this:
Are there any trees or buildings in the signal paths?
If your signals were stronger, I would suggest a bi-directional antenna because the two directions are about 180 degrees apart. Your DB4E would become bi-directional if the reflector screen was removed. That would only be good for the UHF channels, real channels 14-51 as listed on your report; there would still be the problem of VHF-High real channels 7-13.
You could have the two antennas for different directions with an A/B switch to select the antenna needed. Your TV would need to be able to add a channel after scan, like my Sony, to avoid having to rescan after every change of antenna.
An alternate approach would be to have one antenna connected to the antenna input and have the second antenna connected to a separate tuner with its output connected to the A/V or HDMI input of the TV.