The Maghera transmission site is situated on a 400m hill (Irish: Cnoc an Ois) located at Killanena in the East of County Clare, Ireland.

The Maghera television transmitter first went on air in February 1963 on low power before becoming fully operational on 10 September 1963.

It was one of Telefís Éireann's original five main transmitters, the others being Mullaghanish, Kippure, Truskmore and Mount Leinster.

When it was operating on Channel B certain atmospheric conditions during the summer months could cause interference from a transmitter on similar frequencies in Spain, this resulted in viewers in the south west of Ireland occasionally seeing bullfights on their television.

[2] All analogue television transmissions from the site ended on 24 October 2012, and since then the Irish digital television service Saorview, has been broadcast from the site in addition to six national FM radio networks and a number of local radio services.