If you are seeing the Portland digital UHF stations pretty reliably, you are doing very well indeed, since they are all below 0Nm at your location. The trick to VHF digital reception is going to be a better VHF antenna. While the YA-1713 is pretty good, and among the best yagis currently available in the US, a few dB more gain may make the difference between seeing the VHF digitals and not seeing them.
The Wade-Delhi VIP-307 will give you about 3dB of additional gain over the YA-1713, but, by god, it's a monster, and has a lot of its size dedicated to low-band VHF that you don't need. Using a VIP-307 will also necessitate using a heavier-duty rotator, as the 9521a just won't turn that antenna system, at least for very long.
You can look into stacking YA-1713's and they are cheap enough that you can afford to experiment. Many people use a diamond-array of 4 antennas to get additional gain, and I would defer to Midwest DXr about the best way to stack antennas for your situation. He also used to import the Funke PDP-1922 VHF yagi, which has about the same amount of gain on high-band VHF as the VIP-307, but in a smaller package. I don't think he has any more of them available, but you can ask. I am looking around for a Funke-quality VHF high-band yagi, since there seems to be pretty great demand for it, and if I find one, I will let you know.
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Real men don't use indoor antennas; neither do real women!
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