It's a shame you answer questions seemingly with knowledge but make some glaring errors. TVfool shows that in the transition 6/17/09 Dallas will have VHF broadcasting on CH8/9/11 currently channels 8.1/8.2 &8.3 are on channel 9. The CM4228 is a good UHF antenna but at his range it won't work for CH9, I have one and it is combined with a Hi VHF only antenna.From the center of Princeton, TX, WFAA is the only full-power VHF station in earshot (about 50 miles), broadcasting on channel 8. It's also the only ABC affiliate, and in Kansas City, NBC and ABC are the only channels that have 24-hour weather subchannels. NBC has already announced that the "Action Weather" branded subchannel is being deep-sixed as soon as they can find a replacement (probably sports), so I have to pick up ABC (channel 9 here).
According to TVFool.com, though, WFAA is the same general direction (~215°) as most of the local stations, with another cluster a bit farther out and off-axis (~330°). If you're focusing a single UHF rig like a CM-4228, DB8, or even a four-bay at Fort Worth, I'd be willing to bet that you can pick up channel 8.
I think the Sensar is a mistake, as it's mostly VHF focused, and requires a $25 add-on kit to make it as useful for the OTHER 94% of TV waves reaching the OP's house.
Do you want to spend $100 on an antenna that might work on channel 8, or do you want to spend $100 on an antenna that will probably work on the other 16 channels?
Then again, my father-in-law uses a $40 4' combo antenna from Rad Shack, on a 20' pole from Rad Shack, that isn't even straight or properly tensioned, with a $20 amplifier from Rad Shack, looking across over 50 miles of meadows and ridges, and gets perfectly acceptable signals from most stations. Go figure.
The Sensar III is quite capable of UHF reception and has been used in the RV vehicle industry for about 30 years. Have you ever been in a RV and seen that little crank up TV antenna with the red power light. You guessed it an amplified Sensar antenna, no it isn't perfect but it has a lot of experience and is now on it's third generation (sensar/sensar II & sensar III).