You could call the local affiliate and ask them how they processed it for broadcast.
I doubt that any local affiliate would/could utilize HD equipment for a high school game. In cases like yours, they usually modify, or zoom, the standard def feed so that it fills the screen. 9 times out of 10, the result is a picture that fills the screen, but is tragically inferior.
The best advice is that with which I lead this reply... make a friendly call to the local station. The tech guys love to 'talk turkey'. You may even find out info about your local stations plans for future HD.