Many readers here may be waiting until (now) June 12th, to see if they will be able to receive their local digital TV stations with their digital converter boxes (or new digital TV sets), and their existing antenna systems.
My strong advice: Don't wait! If you have a converter box, it will already work. All (USA side) full power stations in the Detroit area are already transmitting digital as well as analog (this is something most of us reading this already know, but you'd be surprised how many people I know who think the boxes won't work until the analogs go off the air!).
Even if you don't have a digital set or converter box (say, you're on the waiting list for your NTIA coupon), you should be looking for potential problems now. What is not widely known is that you can use your existing ANALOG reception to get some idea whether or not you'll have problems with digital reception.
Use the same antenna you are already using, in the same place and position you are already using it, and watch channels 7, 50 and 62 for a while.
Pay attention first to how steady these stations come in. If, from time to time, the picture "rolls" vertically, or "twists" horizontally (loses sync, in tech talk), you are bound to have very serious trouble with digital reception. Next, if you notice that the sound is prone to briefly cut out, the color fades to black and white and back to color, or the edges of subjects in the picture look like they are traced with a pen (uneven frequency response, in tech talk), you may have problems with digital as well.
If channels are free of these problems, and all three stations are snow free or have "only a little snow", you have a better chance of reliable digital reception (not quite a guarantee). Now check channel 7 in particular. If it is snowy, suffers electrical interference (lines or dots moving slowly up the screen) or the picture is full of unwanted lines (interference), you'll likely have trouble watching Fox 2 after June 12th.
These tests are best done on a windy day. Trees blowing in the wind expose multipath problems. If you have good reception on a windy day, you will have good reception on calm days, too. But your reception may be fine on a calm day, and bad when it is windy.
Much has been written about the problems encountered when using (or perhaps TRYING to use) indoor antennas for digital TV. A common fallacy is that indoor antennas can work for a limited distance (usually quoted as between 10 and 20 miles). The fact is, some viewers are getting good digital reception with indoor antennas as far as 50 miles out, while many can't get a station less than a mile away to stay in!
Out to about 30 miles from transmitter sites (from full-power stations, which Detroit's DTVs are), indoor antenna reception is far less likely to be harmed by low signal strength than by multipath. Multipath, oversimplified, is the electronic equivalent of an echo. We all know that a concert sounds awful if you're behind the concrete bandshell, and digital TV reception is no different. Unwanted "echoes" from other buildings/houses/trees can interfere, especially of the most direct path is blocked.
If you live in a wood or vinyl exterior house, you may find that your indoor antenna works where it already is (it might not), if your house is brick, concrete, or metal sided, you probably are accustomed to watching a lousy picture. The first remedy is to place your antenna (and, if necessary, the TV itself) in a room on the side of the house facing most of the TV transmitters (to those of us in Southeast Michigan, that means a room that faces Southfield). If your reception is still unsteady (particularly at UHF), try placing the antenna behind a large window facing Southfield. Which way an indoor antenna is pointed matters less than exactly WHERE you put the antenna.
If you still have trouble, something other than "rabbit ears" on or beside the TV is in order. This does not necessarily mean a trip to the roof. Attic antennas are often a solution to multipath problems. A signal can go through one wall of asphalt and wood far easier than one wall of brick, wood and plaster, possibly followed by several walls of drywall. The loss of signal caused by the roof is basically equal in all directions, so the desired direct path is still the strongest. At this time you're probably thinking you don't want unsightly coax cable running through the rooms of you abode. The secret is to run the cable in the attic to the ceiling of the corner of a coat closet (a place almost nobody ever sees), down the closet, through the floor of the same, into the basement to the edge of the floor right behind the TV, then back up.
If you're still getting poor (or, if in an exurban area, snowy) reception. You're probably dreading having a huge antenna on the roof. Think again. With digital TV, most people who can get over-the-air reception at all can use a SMALL antenna to get good reception. There are no VHF lowband digital transmitters in the Detroit area (and large antennas are large so they perform well on lowband VHF).
One other thing to note. Most of today's converter boxes are far more tolerant of multipath than digital TV sets and HDTV receivers from about 2007 of before.
Good luck to all! Enjoy ThisTV, RTN, Doppler 7 Weather, and Create, and the snowfree picture.