Why do radio stations have 4 letters?

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  1. #these
  2. #television
  3. #begin
  4. #under
  5. #among
  6. #include
  7. #station
  8. #others
  9. #radio
  10. #assigned
  11. #international
  12. #reason
  13. #either
  14. #broadcasting
  15. #those
  16. #because
  17. #prefixes
  18. #letters