man you guy are good and quick! with the pre-amp i have Winegard AP-8700 (
http://www.amazon.com/gp/product/B001DFZ5EW) - it has a built in fm trap so would that still apply? WEBE108 is absolutely the strongest station in the area so i could see how that could be doing it -- especially since channel 4,5 etc which should be weaker according to the plot come in just fine.. or wait since you mention "real channel" could this be a pure VHF issue??
i was thinking about the next step and going to the roof - just my house is VERY high - at least for me... most of my basement is exposed so its almost like a 3 story house... but that may be the way to go either way...