Extended Data Figure 3: Antenna and simulator reflection coefficients.
From: An absorption profile centred at 78 megahertz in the sky-averaged spectrum
a, b, Measurements of the reflection coefficient magnitude (a) and phase (b) are plotted for hardware configurations H2 (blue), H4 (red) and H6 (yellow). The antennas are designed identically (except H6 has the balun shield removed), but are tuned manually during installation by adjusting the panel separation and the height of the small metal plate that connects one panel to the centre conductor of the balun transmission line on the other. The measurements were acquired in situ. c, d, The red curve is the 10,000-K artificial antenna noise source and the blue curve is the 300-K mismatched load.
