Attic installations are a box of chocolates: you never know what you are gonna get...LOL TVFool.com assumes that your antenna is mounted outside: whatever they predict for reception can't predict attic losses due to roofing, HVAC ducting, foil-backed insulation, etc. Frankly, your TVFool.report isn't that strong, and I forsee trouble with FOX, ABC and CW. You really need a fringe area antenna mounted on the roof if you want reliable reception from the Atlanta stations. Unfortunately, using a larger antenna in the attic isn't a replacement for a roof mounting.
If I was doing this installation, I would use a Winegard HD-7696P mounted on the roof aimed at 130 degrees, as measured by your compass. I would also use a preamplifier like an AntennaCraft 10G201, which combines high gain along with high input capability.
Try this in the attic if you like, but you will only be really happy with it if you mount it on the roof. Good Luck.
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