If there was a TV at Collinwood, then residents can't have watched much on it, what with no cable back then, and daily thunderstorms. If there was an antenna on the roof, then somebody (Julia, maybe) spent half of his or her waking hours up on the roof in the wind and the lightning, re-attaching it after every gust of wind. And if the antenna was in the attic, then the ghosts would have a glorious time wiggling it around in order to entice people upstairs for some fun and games.