I'm in the northern Detroit suburbs (65 miles from the Toledo towers), and I have a Winegard YA-1713 in my attic. In analog, 11 and 13 both came in around a 6 (daytime) / 7 (evenings) out of 10. When their digital signals were temporarily on UHF 17 and 19, I never got a hint of either with my UHF antenna (Channel Master 4228, also in the attic). But 17 and 19 were at a rather low power. The current digital signals on 11 and 13 only occasionally come in late at night on the YA-1713 from the attic (my tuner needs a signal strength of at least 37-ish to lock).
I recently did a daytime test with the YA-1713 outside, and found quite an improvement. Both 11 and 13 locked solid in digital with signal strengths of 64 (for both channels). I plan to put an antenna (or two) outside on the chinmey before the weather gets cold to improve my reception.
I think a lot of the digital VHF problems are caused by people having UHF-only antennas (where most of the digital assignments were prior to June 12), regardless of whether they're indoor or outdoor. For those with indoor combination VHF/UHF antennas, it appears that digital VHF is much poorer than digital UHF at penetrating buildings, and the FCC grossly underestimated this (hence so many VHF stations scrambling to increase power around the country right now). Perhaps within a year or so, more stations will have upped their power to satisfy most peoples' needs. My recent outdoor antenna testing found that, when I do put up an outside antenna, quite a few stations that were only marginal in the analog days will now lock solid in digital for me, so I'll eventually end up with quite a few more channels as a result of digital tv.