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The second harmonic of any FM station freqs 99 to 102 could be interfering with channel 11 and freqs 105 to 108 interfere with channel 13. You have both ranges of freqs well in to the green on your FM report. I have channel 10 and 13 in my area and I could not tune them in. The signal was 10%. I borrowed a spectrum analyzer and determined 2 local radio stations were hammering me with their second harmonic. I installed a $3 HLSJ and the signal jumped to 60%+. I'm 60-70 miles away from each station. Both are 2edge, but I am well above any nearby (1/4 mile) trees. Make sure to use a 75 ohm terminator on the low side and install the HLSJ before any pre-amp, preferably as close to the antenna as possible.
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