hd broadcast

i have a HD tv without a HD tuner built in. I subscribe to comcast cable but i didn't add on a hd cable package and HD tuner box yet. The HD conversion next year effects over the air broadcasts picked up by rabbit ears as i understand it.

Will the cable supplied by comcast still work after the conversion or do i will i need a hd cable box from comcast then?
Fred - HD conversion next year applies only to over the air broadcast. Cable and satelite providers can do whatever they want.