With splitters, there is what's called an "insertion loss" each time you split one antenna to feed two receivers. In strong signal areas that isn't a big deal, but channels 7 and 10are using (for now) fairly weak powered UHF transmitters for digital. Here's the circle for KHQA-DT
and you'll see that Edina is right on the edge. It's about the same for channel 10's UHF digital.
So putting in the splitter is putting your reception quality over the edge of the cliff. The splitter's got to go, or you'll need to put an antenna pre-amplifier in, which might not be a bad idea anyway. You'll want the kind that mounts on the mast just below the antenna. If it were mine, for the FM I'd go with a good omni-directional antenna with its own coax, but ask around...that might be overkill. Although
using that big C.M. 3020 antenna with a good pre-amp could pull in a lot of FM stations from all over. 80 to 100 miles out (and sometimes more) should be possible for the bigger FM stations. If that's what you want to do, just get a good antenna rotor and skip the rest of this post. You can point it towards KTVO or towards Quincy and do pretty well.
Now, about why you cant get KTVO-DT: their UHF digital transmitter doesn't get out as far as their analog channel 3. And they'll stay on UHF after Feb 09, like almost all of the present stations on channels 2 thru 6. You're just not going to get away with picking up KTVO off the back of the antenna anymore. Like above, you'll need to point your existing C.M. 3020 with a rotor to whatever station you want. But if you decide you don't need the rotor, you will need to add a separate UHF antenna to point at KTVO if you want whatever HD programs ABC sends along. Then, jiust keep your C.M. 3020 pointed at Quincy. Antennaweb.org
is a pretty good tool to see what kind of antenna will work for any particular location. Which, by the way, shows you might
be able to get KYOU Fox15 which is about 12 miles north of Fairfield. (Don't ask why it's still there instead of with KTVO, cause they effectively run Fox15.)
One more paragraph with a cautionary tale about rotors: When I was growing up, about 10 miles north of Ottumwa, most everybody used rotors out of necessity, cause back in the day, we could only get NBC from Des Moines, CBS (and ABC) from Cedar Rapids, and of course KTVO came in off the back of whatever you used. They worked OK and was the best solution for the big antennas that were used. But BEWARE OF ICE STORMS! Back in the day, we'd get the bright idea to watch the ABC Sunday Night Movie (that really dates me!) and we wanted the absolute best picture. So, we'd point it the antenna towards KTVO, get an ice storm the next morning, and bam, it's one channel TV until the next thaw, which seemed to take a couple of weeks.