The Voyager 2 high-gain antenna dish weighs about 3.7 kg? No — the published spacecraft sources I found confirm the dish is about 3.7 m in diameter , but they do not give a clear dish-only weight in the material I could verify here.

What I can say confidently is:

  • Voyager 2’s total launch mass was about 722 kg.
  • Its high-gain antenna is the large 3.7 m parabolic dish used for communication.

So the best verified answer from the available sources is: the dish’s exact weight wasn’t stated, but the spacecraft itself launched at roughly 722 kg.