There are nothing nearby that could be causing interference and the utilities are all underground, but the FM suggestion could be an issue. As I mentioned before my previous setup didnt have this issue so I have to suspect something nearby is the culprit. My previous address without this issue can be found here:
I see that NBC has moved from Green to Yellow even only moving 8 miles down the road. ABC (channel 2.1) was my problem child at that location, and I was glad to have a motorized mast head because the antenna was mounted outside there and needed adjusting after any big storms.
As a test I turned the amplifier gain all the way up and all the way down on the Lava box with no change in the results of a channel scan. Additionally, using the HDHR config gui application, I can see that when I tune it to the nearest NBC station (channel 10 real, trying to get 11.0 virtual) I see 72% signal strength, but no picture and 0% signal quality. Should that be interpreted as a symptom of interference?
I have decided on the Channel Master CM-7778 Titan 2 amplifier per your suggestion. The Juice amp is a little pricey. It says mast mounted. Do I have to mount it to the mast in the attic or can I just put it on a shelf next to my distribution block? If it needs to be mounted on the mast or at least grounded to it I can do that of course. Also, is it possible that my current antenna would work better if it were grounded? I didn't ground it inside the attic since i didn't think it was necessary, and running a separate ground wire up there would be tough to do.
Finally, looking at new antennae, which of the following would be most appropriate for my location?
Antennas Direct C4-CJM
Channel Master CM 4228HD
Thanks again. Very helpful.