Digital TV is either very clear, or not at all. It is kinda like FM radio, compared to AM radio.
Many of us are on the fringe, & are ok with watching a fuzzy picture. With Digital, likely there will be no signal at all unless you can improve the wire, antennea, or a booster. We are the people that will suffer from this 'upgrade'.
Digital stations can broadcast multiple subchannels. For example, 11 'here' is NBC - they are broadcasting NBC as well as Weather plus on channels 11.1 and 11.2. The ABC station is broadcasting ABC on 5.1, as well as rebroadcasting news & weather on 5.2. There an unknown station I didn't know exsisted - it broadcasts 4 channels under the same number - can't think of it, but 2 outdoors/cooking type channels, one kids cartoons, and one religion. This one come in rarely.
So, we are getting more channels - I'm pulling in stations from 80-100 miles away. But, not always. Rain will knock about all of them off the air.
If you are trying real hard to get digital TV, try on a cold clear day. High pressure, calm wind day. Those seem to be the best for pulling things in. Avoid certain sun angles too - for me 9-11 and 3-6 are poorer, other times are clearer. One winter morning when it was 15 below at 6:00 am I was getting 26 channels.... With old analog I only get 10 at the most.
But then it rains, and none of the digital come in - so do I get more or less?
Low-power repeater stations out in rural areas will be allowed to continue rebroadcasting on analog. So if you are picking up UHF channels from a repeater station, find out if they are going to invest in switching or not.
The converter boxes seem to be much the same. There are some called 'pass through' which allow you to get both digital & analog channels - these cost a tad more, are harder to find, but are nice if you will be in an area that has an analog repeater station. Without this pass-through feature, you get only digital channels from the box. There are ways around that, but takes more wires, more fuss.
To test digital TV, I picked up a $60 computer digital tuner from Best Buy. It plugs into USB, has an antennea jack, a remote even, and a small antennea. It takes a fairly fast computer. You can watch digital TV on your computer. My model even allows you to record an hour or so to hard drive. If you are into computers more than TV - this might be a nice addition to a laptop, to see how digital TV works in your location.
I took this little unit to the Minneapolis/ St. Paul area, and wow - got like 65 channels. Why do all those town folk pay for cable, when all that is available from the little cheap 12 inch atennea that came with the unit? Wonder what they would get with a real antennea? Sheez.
--->Paul