The FM signals don't look like a serious problem based on my estimate of your location:
http://www.fmfool.com/modeling/tmp/9...b/Radar-FM.png
I don't understand how the two-antenna trick can null KIXE co-channel interference because it is in the opposite direction.
http://www.hdtvprimer.com/antennas/ganging.html
I think it would take stagger stacking to improve the F/B ratio.
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The only channels I'm really interested in getting are: 9, 10, 48, 35, 20, 43 which are all at 159 degrees.
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They are not all in the same direction, 43 and 20 are at 342.
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I have a small yagi antenna
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Which yagi?
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They go into a signal combiner
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What combiner?
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It worked quite well for 6 years. Occasionally channel 9 would drop out but mostly they all came in decently. But just the other evening I lost all channels.
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A sudden change like that indicates a defect in the antenna system like a bad connection or component.
I would have thought trees growing, but you said they were not in the signal path.