A concrete wireless mast stay anchor 5C for mast 5, of which four were used per 1914 antenna mast. It measures 3.7m long by 3.7m at the base (3.7m x 2m at top), and up to 0.9m high. Mass of ca. 98 tons. Five steel ‘eyes’ providing attachment points for a total of seven guy wire tensioning turnbuckles splayed out and ran deep into the concrete. The form was used widely across the Marconi Empire wireless scheme.

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