Hi, Craig:
FM Fool doesn't link like TV Fool does. You have to post an image.
I did an FM report for your area based on 53158 zip, which is centered at 42.521693,-87.884431, near the intersection of route 165 (104th st) and route 31; or more exactly 105th st and 65th ave. See attachment 1.
It shows some very strong FM signals, but is probably different from your location. I'll try to do a closer estimate, unless you want to send me a PM with your address or coordinates.
I did another estimate based on your TVFOOL report, which is a little better. It puts you south of Anderson Park near 93rd st and 29th ave near St Joseph's Home. See attachment 2.
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I'm not having any problems w/ the majority of my stations, but am wondering if those two stations could be hampering any of my DXing.
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It's possible, but I would need to know a little more about your setup and which weak stations you are hunting. There are a lot of factors involved.
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Are there any hard and fast rules, or is it going to vary among frequency and other variables?
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No hard and fast rules without precise lab measurements, but a lot of general guidelines.
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My traps are set to IN, but I've seen recommendations for two in some cases
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The cases where two are needed is when the FM signals are much stronger than your strongest TV signals, using the Pwr dBm scales on the reports like yours. But, there are other factors, like the frequencies of the strongest FM signals and the frequencies of the weak TV channels; the second harmonic (2x FM freq) of FM signals can interfere with VHF-High channels.