5.180 in the Radio Frequency Table Allocation of Ireland.

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Content Type

ITU FOOTNOTE

Title

5.180

Description

The frequency 75 MHz is assigned to marker beacons. Administrations shall refrain from assigning frequencies close to the limits of the guard band to stations of other services which, because of their power or geographical position, might cause harmful interference or otherwise place a constraint on marker beacons.
Every effort should be made to improve further the characteristics of airborne receivers and to limit the power of transmitting stations close to the limits 74.8 MHz and 75.2 MHz.

Source

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