  Digital radio arrays have become an effective tool to measure air showers at
energies around and above 100 PeV. Compared to optical techniques, the radio
technique is not restricted to clear nights. Thanks to recent progress on
computational analysis techniques, radio arrays can provide an equally accurate
measurement of the energy and the depth of the shower maximum. Stand-alone
radio arrays offer an economic way towards huge apertures, e.g., for the search
for ultra-high-energy neutrinos, but still require technical demonstration on
large scales. Hybrid arrays combining radio antennas and particle detectors
have already started to contribute to cosmic-ray physics in the energy range of
the presumed Galactic-to-extragalactic transition. In particular, the
combination of radio and muon detectors can pave a path to unprecedented
accuracy for the mass composition of cosmic rays. This proceeding reviews
recent developments regarding the radio technique and highlights selected
running and planned antennas arrays, such as GCOS, GRAND, the SKA, the
AugerPrime Upgrade of the Pierre Auger Observatory, and IceCube-Gen2.
