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Here are the results of the installation of the new antennas. I replaced the stack of YA 1713's with a single Antennacraft Y10-7-13. At the 15 foot height off the roof a single Y10-7-13 has better gain and than either a single or stacked and phased YA 1713 setup. I added another five feet of height for a total of 20 feet off the roof which added another half db of gain. The Antennacraft antenna is also rejecting interference better as well.
After installing the Hollands FM filter I am still seeing interference though it is not as frequent as it was before with the YA 1713's stacked. After installing the Y10-7-13 I've found this antenna to be superior to the Winegard antennas. A single YA 1713 could not fully lock onto Ch. 7 while a single Y10-7-13 does and also rejects the offending interference better. I am no longer having any kind of complete dropouts of the signal either like before.
So, I don't know if that FM signal is the problem though or even a co channel 7. I am actually starting to think it might be something in the local area because the interference is generally not long lived and does not occur when skip on VHF channels is present. It would make sense if a co channel 7 was causing problems at a time when other VHF skip is present but that is not the case. It also seems to occur at nearly the same intervals of time during the day. This is not a constant problem. The signal drops a few DB and the interference kicks in and then it vanishes the signal is back to its normal strength here.
At this point I can live with the current quality of the picture. The signal is fine during the time of day when I do watch Ch. 7. The only time the interference is happening now is when is a few minutes here and there during the mid day when I am not going to be watching.
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