I can't imagine this being a hugely popular item, but it's certainly possible to get TV reception in the office or on a surface train if you are near a window and relatively near a broadcast tower. In a subway, signals can be repeated through leaky cable, the same way cell phone signals are done in many places and FM radio is done in some tunnels.

Usefulness is irrelavant anyway; I think the real market is people who have to have the latest toy, even if they are never going to use it.

Does anyone actually get TV reception anywhere this device is likely to be, like the office or the train? I gave up on free-to-air reception about 6 months after I got cable.

It's now more useful if you can export your TIVO recordings to a portable player, or something similar. (Personally I still use VHS, so my milage will vary.)