The site has a 155 m (509 ft) guyed steel lattice mast erected on land that is itself about 187 m (614 ft) above sea level. The radio broadcasts cover the majority of Pembrokeshire, except the north eastern part of the county.
When UHF analogue television was added in 1990, those services were provided only at very low power and only designed to cover the small villages of Puncheston, Castlebythe, Little Newcastle and Rosebush, which are all located within about 7 km (4 mi) of the mast.
It currently carries three digital television multiplexes at twice the ERP of the analogue services that they replaced, thus providing digital TV to a much larger area than had been served before.
Digital Switchover started at Haverfordwest, mirroring the changes at its parent transmitter at Preseli. BBC Two closed on channel 66 and ITV1 Wales switched to that channel for its final three weeks of service. The BBC multiplex A started up on channel 56 vacated by ITV.
All the remaining analogue TV services closed and were replaced with the standard three multiplexes of Freeview Lite. Notice that unusually, the digital TV services are broadcast at twice the ERP that had been provided in the analogue TV days. At most sites, the digital services are broadcast at a fifth the ERP of the old analogue channels.
As a side-effect of frequency-changes elsewhere in the region to do with clearance of the 800 MHz band for 4G mobile phone use, Haverfordwest's "BBC B" multiplex was moved from channel 48 to channel 47. Additionally, all the transmissions at the site gained a +3dB power boost.