The Craig-Cefn-Parc television relay station is sited on Mynydd Gelliwastad to the west of Clydach in the Swansea Valley.

It consists of a 17 m self-supporting lattice mast standing on land which is itself about 160 m above sea level (and about 90 m above the village of Craig Cefn Parc which it serves).

The transmissions are beamed to the northwest to avoid cross-channel interference with the Alltwen transmitter which is about 4 km to the northeast and which uses the same frequencies.

When it came, the digital switchover process for Craig-Cefn-Parc duplicated the timing at the parent station, with the first stage taking place on Wednesday 12 August 2009 and the second stage was completed on Wednesday 9 September 2009, with the Kilvey Hill transmitter-group becoming the first in Wales to complete digital switchover.

After the switchover process, analogue channels had ceased broadcasting permanently and the Freeview digital TV services were radiated at an ERP of 2W each.