Based on the recommendations of Mouser and Manuel, Layla and I have decided1 to go for a two-antenna solution.
Half of this is a relatively inexpensive, powered VHF/UHF antenna for picking up the local old-school analog VHF stations. This thing is cheap and rabbit-ear-tastic, and has a huge glowing blue LED that leaves something that looks like the Batsymbol on our family room ceiling. It picks up VHF analog channels with enough competency that it's viewable, but doesn't do the UHF thing all that well. All of this, just so people don't have to learn new channel numbers2.
The other half is pictured at right—it's an Aston Martin Antennas Direct DB4 multidirectional UHF array. This sucker will be mounted in the attic, and will serve to receive all of the HDTV broadcasts in the area.
I've learned an interesting fact in all of this: although some HDTV channels have VHF channel numbers (e.g., KCTS owns analog 9, and digital 9-1, 9-2, 9-3, and 9-4), there's not enough bandwidth to overlay digital and analog signals in the same channel, and so this is all a ruse that fools the TV into displaying that the signal is received over channel 9, when in reality it's being sent over an unused channel—almost exclusively in the UHF band. So even though we get digital channels 4-1, 7-1, 9-*, etc.; these are in actuality mapped down from the UHF.
So the new UHF antenna really will be responsible for handling all of the HDTV broadcasts. Sweet.
1 "Decided" is a bit too strong. "Settled, after we were cheapskates and bought only an indoor antenna, and found it to be insufficient" is really more like it.
2 When are we going to get to the future of addressing and name these channels with GUIDs, anyway? Quick! Change the channel to 64DCA51A-A3FD-4C18-93C0-D96F5F50E969!

Whats the point? Do you even watch TV?
heheh - that GUID comment cracked me up.
Raven-
News and PBS. And occasionally, stuff like CSI.
Rob-
If you think that's funny, just see my joke at 95768fb4-ff04-45ba-9da1-f9a4f8dd4d91!
--D
Aww look at the cute little antenna. If you wanted the big kahuna of anntennas I couldve sold you the monstrosity that came with my house.