5.155B in the Radio Frequency Table Allocation of Ireland.

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Content Type

ITU FOOTNOTE

Title

5.155B

Description

The band 21 870-21 924 kHz is used by the fixed service for provision of services related to aircraft flight safety.

Source

https://search.itu.int/history/HistoryDigitalCollectionDocLibrary/1.43.48.en.101.pdf