5.517A in the Radio Frequency Table Allocation of Ireland.

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Content Type: ITU FOOTNOTE
Title: 5.517A
Description: The operation of earth stations in motion communicating with geostationary fixed-satellite service space stations within the frequency bands 17.7-19.7 GHz (space-to Earth) and 27.5- 29.5 GHz (Earth-to-space) shall be subject to the application of Resolution 169 (Rev.WRC-23). (WRC-23)
Source: https://search.itu.int/history/HistoryDigitalCollectionDocLibrary/1.43.48.en.101.pdf