It's due to works on Mount Leinster's primary transmission site.
Several parts of the Midlands, East and South East are without radio for the next two days.
Maintenance works are being carried out at Mount Leinster's primary 2RN transmission site.
The works are expected to be completed by tomorrow, and people are being encouraged to alternatively listen online.
Midlands 103 listeners will unaffected by the outage.
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