Thanks guys! Sorry Teleview, didn't see your comment before I replied to Tony. I think I'll try the Y5 first, maybe even give it a shot in the attic out of curiosity first, it can't hurt, and it's a hell of a lot easier than getting waaaaay up on that ladder! Teleview, I'm not sure I understand why I shouldn't put the combiner before the preamp, unless you're thinking that with the C2V pointed in the right direction it would overpower them? That way I could then run a line from each output of the preamp to my two TV's, instead of using a splitter down the line which would cut in half the preamp power, right? I'm fine with experimenting, but I really am at the top of the ladder, reaching back over my head as high as I can to make these connections (and 35' in the air), so the less time I spend up there the better!
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One other thing, the combiner you quoted is discontinued, how about this one instead (plus, it's a lot cheaper and has 5 stars)? Pico Macom UVSJ UHF VHF Band Separator/Combiner for Antenna (UVSJ)