The Collaborative International Dictionary of English v.0.48:

broadcaster \broadcaster\ n.
   1. someone who broadcasts on radio or television.
      [WordNet 1.5]

   2. a mechanical device for scattering something (seed,
      fertilizer, sand, salt, etc.) in all directions.

   Syn: spreader.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

broadcaster
    n 1: someone who broadcasts on radio or television
    2: a mechanical device for scattering something (seed or
       fertilizer or sand etc.) in all directions [syn:
       broadcaster, spreader]