There is portable (small, watched while still) and then there is mobile (smaller, watched while moving as in car).

Noboby has ever really had good reception with even an analog tv while moving down the road in an rv have they? I was not impressed when I saw it in the 90's.

And, nobody has really ever made a true mobile tv?

There will be a demand for both portable and mobile tv when you can get HD picture quality from a cheap antenna, IMO....watch.