I am running it at 1280 x 1024 on my 19 inch monitor (Performance). My 32 inch ACER HD TV won't run it. On yours you have the same issue as I do as Vantage in higher resolution(Extreme) runs @ 1900 x 1200. Your TV has a maximum resolution of 1440 x 900.
The maximum resolution of mine is 1368 x 768. Some 1080I HD TV's can run 1900 x 1200 @30 Hz check you ATI CCC to see if it is listed.
So 1024 is the minimum screen height Vantage will run, it's not the program it's your TV Bro.