hmmm... what color is the ballast? If it is the blue lumatek then you have an old model with little RF shielding built into the casing. IF it is the purple one, and you are getting this, i suggest putting it as far from the t.v. as possible. I don't run off of an antenna, i use satellite. I have never had a problem with either my 600 or 400w interfering.
Try to separate the two things as far apart as possible.
I suggest getting an outside antenna that wires through the house. No rabbit ears if that is what you are using. Also, is your television digital or analog? Could have alot to do with it.
Maybe someone else who has had the same prob could respond.