Hey Ron,
How do you like the Seaworth TV?
First year for us with the 19" Seaworth. It worked pretty well for us with just a regular Shakespeare marina antenna. We had to mount ours from the ceiling with a standard aluminum mount with a swing arm.
So far it's been fine. I used the existing bridge mounted antenna (Dantronics). It looks like a Shakspeare.
We watched a DVD the other night and that worked fine also. Marina neighbors are impressed. Also a little upset because someone else told them they needed "digital" antennas so they replaced theirs. The antenna just picks up and amplifies the signal, it doesn't know what is in the signal. Also, they bought home antennas which are directional so the signal fades when the boat turns.
My only complaint is that the button locations on the remote are not very intuitive. Lots of times I have to turn on the light to find the correct button to push. Also, the lavels are a little hard to understand. Better would be to have the ones that are used often near the top and "menu" and such near the bottom or under a cover.