Concrete trapezoidal radio mast guy anchoring block measuring 2.3m long by 2m wide at the base, 2.3m by 1.25m at the top, the sloping face facing 1914 antenna mast 6. A now cut steel loop was embedded within the block, providing an anchoring point for a guy rope of uncertain purpose. It is currently thought to have been for providing additional outer masthead support.  All outer masts have the same arrangement.

Source: Rowlands, J., Marconi's Carnarvon Station 1912-1939: a journey into early commercial wireless in north Wales' Second Edition, 2023.

RCAHMW, 2023.