The mast was located approximately 3.5 kilometres (2.2 mi) east of the village of Summerhill, in a field south of the R156 regional road at Clarkstown.

Constructed in 1988 for the transmission of Atlantic 252 on 252 kHz, it used one 248-metre (814') high guyed steel framework mast with triangular cross section, insulated from ground.

[1] The ground around the mast and the entire transmission site bed are lined with copper for conductivity.

Atlantic 252 ceased operations on 2 January 2002 and sports radio station TEAMtalk 252 briefly took over the frequency for a few months in 2002.

[4] On 31 March 2023, RTÉ announced that the longwave service would be discontinued on 14 April of that year.