Slowmotion,
It would really help to have a TVFool report with your exact location. Location is everything, and if you're in a favorable location, that 48 foot tower could make all the difference.
That said, I'm not aware of a rotor with a timer either (though there are computer-controlled ones that you might be able to program for that purpose...) and you would probably want to choose a particular set of stations to use. Plus, the Salisbury stations might be close enough that you would be able to see them off the back of your antenna anyway, so for CBS, ABC, CW, and PBS, aim may not be as big of a problem.
- Trip