This application will be unavailable from 17:00 Friday 17 October to 17:00 Saturday 18 October to facilitate essential maintenance. Apologies for any inconvenience caused.

5.155B in the Radio Frequency Table Allocation of Ireland.

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