It was originally built in 1987 as a fill-in relay for UHF analogue colour television covering the communities of Cilycwm and Rhandirmwyn.

It consists of a 17 m self-standing lattice steel mast standing on a hillside which is itself about 190 m above sea level.

The transmissions are broadly beamed west and east (through north) to cover the targets.

Cilycwm transmitter re-radiates the signal received off-air from Carmel about 40 km to the southwest.

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