Barack Obama wants to wait on the DTV shift currently scheduled for 17 February. On the grounds that it’ll be a mess, this is a good idea. But nothing can make it a better idea. It’s not that the train has left the station. It’s that the new OTA (over the air) Oz is mostly built-out and it’s going to fail. Not totally, but in enough ways to bring huge piles of opprobrium down on the FCC, which has been rationalizing this thing for years.

I explain why in What happens when TV’s mainframe era ends next February?. Most VHF stations moving to UHF will have sharply reduced coverage. The converter shortage is just a red herring. The real problem is signals that won’t be there.

Most cable customers won’t be affected. But even cable offerings are based on over-the-air coverage assumptions. Those may stay the same, but the facts of coverage will not. In most cases coverage will shrink.

FCC maps (more here and here) paint an optimistic picture. But they are based on assumptions that are also overly optimistic, to say the least. Wilimington, NC was chosen as a demonstration market. Bad idea. One of the biggest stations there, WECT, suffers huge losses of coverage.

Anyway, it’s gonna be FUBAR in any case.