I think I am in a valley (my complex has valley in the name, DOH! :) ). Roof is not an option (HOA rules, but they do allow the satellite dish). There was a crappy antenna with preamp in the attic already (looked mid 80's vintage), so I just swapped in my CM, removed the preamp (no power cord to it, so it must not have boosted the signal that much), and voila, I had the DC stations coming in great.
But zilch on the baltimore stations. I'll recheck the analog stations and see if I can get 45 at all.
good news about WJLA. I was bummed to miss Alias in HD (although I did get to see Sopranos in HD for the first time).