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Let me put my own twist on the color code.
Green = easy, a rooftop antenna will pick those stations up in most directions. See antenna gain pattern
Yellow = solid outdoor if aimed at. Weakest you can get in attic. More than likely will break up and pixelate.
Red = difficult outdoor, you can't have any obstructions. Not reliable. If you need these channels, you must get a high gain antenna aimed dead on. Will not show up in attic at all. Too weak
Gray = dxing setup, extreme measures, way above trees, might show up during tropo events. Don't even look at these.
* antenna height is your best friend, higher is better *
You need a big directional antenna for reception of red channels.
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