Detection of (ultra-) high-energy cosmic rays with the use of radio frequency emission from
extensive air showers has been proven as complimentary to existing ground array detection tech-
niques. Great progress has been made in the understanding of the emission processes and in their
Monte Carlo modelling. These have led to experimental results, notably also at the Auger Engi-
neering Radio Array, on energy, angular and mass composition resolution of the primary cosmic
rays. Recent results are reported. The measured resolutions turn out to be competitive with exist-
ing techniques and they have independent uncertainties. Implications for cross-calibration with
existing techniques and for future large-scale applications of radio detection of ultra-high-energy
cosmic rays are discussed.