Looks like I may have fixed it.
I moved the antenna ~3 feet to the left (a bit further away from a metal roof vent), and aimed it in the "wrong" direction.
This new alignment does not point toward the towers, but it also does not point toward my power lines in the alley.
It seems to be much better.
I now have the Clear Stream 2V, the Radio Shack FM trap, a high bandwidth splitter, one leg going to my TV, the other leg terminated for right now.
All channels seem good, with no pixelated images or audio drop-outs...as of yet.
Thanks for your help, AVS forum.