If you count local community cable television, then yes, I have done that a couple of times.

My only appearances on commercial television have been: (a) in a video clip, taken from a helicopter, of a traffic accident scene wherein I was standing next to the car I was driving which had very nearly been struck by a school bus (BTW, it's true what they say: your life really does flash before your eyes when you know you're about to die!); and (b) in a video clip accompanying a news story about a sailing ship in the Philadelphia harbor that was decorated as a walk-through "Haunted Ship" for Halloween, wherein I was dressed as a witch and cackled at the camera.