On what frequency shall a blind transmission be made?

Question

Question Quiz BPL Hot Air - Balloon Pilot License - Communication

QuizVDS · Accepted Answer

On the current frequency

QuizVDS · Answer

On a tower frequency

QuizVDS · Answer

On a radar frequency of the lower airspace

QuizVDS · Answer

On the appropriate FIS frequency

Id 152 - BPL Hot Air - On what frequency shall a blind transmission be made?