What is the meaning of antenna?

noun

• An electrical device that sends or receives radio or television signals.
  • synonyms: aerial, transmitting aerial
• Sensitivity similar to that of a receptor organ.
  • usage: "he had a special antenna for public relations"
  • synonyms: feeler
• One of a pair of mobile appendages on the head of e. G. Insects and crustaceans; typically sensitive to touch and taste.
  • synonyms: feeler