Leo says that there's an app for that. The DirecTV app for iPhone and iPad would allow him to turn his iPhone and iPad into a mobile TV. He could log in and watch, record to his DVR, etc. It's limited right now on what people can watch, but it can be a solution.
Another solution is the SlingBox, which would enable him to watch anything from any internet connection, and they have an app as well ($29). He can watch content from his DVR, too.