All-sky radio image at 408 MHz from the Haslam survey (Haslam et al. 1982). The solid white lines indicate ±10° north and south of zenith (∼FWHM of the primary beam at 125 MHz). The blue line shows the horizon at the HERA site, for an LST centered on the Fornax field at transit (Fornax A can be seen at R.A. = +53°, decl. = −27°). The green line shows the horizon at transit for the J0137-3042 field.