Extended Data Figure 2: Low-band antennas.
From: An absorption profile centred at 78 megahertz in the sky-averaged spectrum
a, The low-1 antenna with the 30 m × 30 m mesh ground plane. The darker inner square is the original 10 m × 10 m mesh. The control hut is 50 m from the antenna. b, A close view of the low-2 antenna. The two elevated metal panels form the dipole-based antenna and are supported by fibreglass legs. The balun consists of the two vertical brass tubes in the middle of the antenna. The balun shield is the shoebox-sized metal shroud around the bottom of the balun. The receiver is under the white metal platform and is not visible.
