Radio signals from extensive air showers with the energies $E_0\geq10^{19}$ eV according to data from the Yakutsk extensive air shower array

A radio instrument and results obtained from the measurements of the $32$-MHz radio signal from particles of extensive air showers (EASs) with energies $E_0\geq1\times10^{19}$ eV are reported in brief. The data were obtained at the Yakutsk EAS array in $1987$–$1989$ (the first series of measurements) and in $2009$–$2014$ (new series of measurements). The radio signal from EASs with energies above $10^{20}$ eV was detected at the Yakutsk EAS array for the first time, including the shower with the record energy of $\sim2\times10^{20}$ eV for the Yakutsk EAS array.