As far as I know, the Browns are in HD this weekend, one of CBS's 3 HD games this week (against the Cowboys). I believe they're also in HD the following two weeks...one more time on CBS, and one game that Fox will pick up since the road team will be an NFC team.
Sure enough, this schedule:http://www.sportsline.com/cbssports/schedules/page/nfl
...shows Browns/NY Giants a week from Sunday in HD. The following week, FOX has the Browns, as they host the Redskins...and nearly all of FOX's games this year will be in HDTV. The only possible conflict is if FOX has more than 6 games in a week, and that week (10/3), they only have 5.
The website that tells you your mileage and direction to the broadcasting area did not mention an available digital station for CBS. They are wrong, right?
Unless I've been dreaming watching U.S. Open tennis and CBS dramas and sitcoms in HD via WOIO/19.
So, yes, the game is (as far as anyone knows) in HD this weekend, and yes, you should be able to get it fine on "Cleveland's CBS 19(-1)" with any decent antenna. No, the Terk is not a decent antenna.
Again, you shouldn't need a rotator or to move the antenna unless you are looking for out of market stations from places like Youngstown and Erie. I bet if you got a really good antenna and swung it around, you might have a shot at Erie, if they're putting out DT signals.
But for Cleveland...no moving needed, everyone's basically in the same direction from you.