A trapezoidal concrete wireless mast stay wire anchor 16A for mast 16, for the 1923 antenna extension array, which used 400’ steel lattice masts to support the inverted-L antenna. Three such anchors per mast were used for single-height staying. Each anchor featured an iron attachment point for turnbuckle tensioners and two iron loops, used for temporary guying during erection, either side. It measures 3.5m long by 2.6m wide at the base.

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

RCAHMW, 2023.