What does AF mean on radio?

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Tags

1. #station
2. #alternative
3. #moving
4. #message
5. #frequency
6. #signal
7. #allows
8. #provides
9. #remove
10. #option
11. #december
12. #learn
13. #range
14. #template
15. #first
16. #receiver
17. #different
18. #becomes