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Look at the Antennacraft Y10713, with 9.4dBi forward gain (don't know which channel that's on, though) and 16.5dB front to back ratio. Winegard used to make a similar one with slightly higher gain, the YA 1713, but it's discontinued, though someone may still have stock on it. But whether or not you can get channel 10 with a -12dB NM and 2-edge condition, from within an attic, I don't think anyone could say. But I'm astounded you get what you get now, so if it were me, I'd try it.
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