Criggion Radio Station was a transmitter site latterly operated by BT on behalf of the UK Ministry of Defence.

Operating on 19.6 kHz with the callsign GBZ, the station was used until its shutdown on 1 April 2003 for sending messages to submarines.

Criggion's VLF antenna was hung from three free-standing steel lattice towers at 182.9 metres (600 ft) tall, three guyed masts at 213.4 metres (700 ft) tall and a rock anchor.

The towers and masts were demolished in August 2003 but, although there is now less obvious visible evidence that a large radio station existed on the site, the derelict main transmitting building still survived in 2011 and the foundation sites of the former masts can be still be located on satellite and aerial photographs.

As of May 2013[update] the remaining parts of the station were reported to be in a state of disrepair.