[jpdtv]

I had a suspicion that the diplexer was the problem. I tried a hybrid splitter/combiner from radio shack and now I'm pulling in 40+ channels so there doesn't seem too be much conflict, and I get just about all the channels I want. I could probably get more separately but this gives me the most convenience.

I agree that based on my distance I'm surprises the C2 is pulling in as much NY as it is from the attic (I didn't event mount it cleanly; it's leaning on a shelf on the east side of the house right against the wall). once I run things through the whole house to 3/4 TVs I'll see if I need a preamp on each antenna but right now putting just one at the combiner seems to be doing the trick.

Thanks much for the help!