I'm surprised that your results were no better with the antenna mounted outside. I'm not too familiar with that antenna, but the advertised gain specs are mediocre for a large antenna. The best defense against airplane flutter is a high gain/highly directional antenna. There are still no guarantees, but I would think your chances are good with the supplied report.
I suggest either the Winegard 7697 or 7698 combo antenna. If you don't mind having 2 antennas, the Winegard YA-1713/ 91XG combo would be even better for about the same price.
This is what I would do, but hopefully others will chime in with other suggestions as well.
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