Measuring the properties of cosmic rays with the radio technique

The radio emission from air showers is now routinely detected to measure the properties of cosmic rays. An overview is given on recent experimental activities, including observations with the LOFAR radio telescope and the Auger Engineering Radio Array at the Pierre Auger Observatory. Recent results will be discussed. We will give an outlook on our ongoing project to equip all surface detectors of the Auger observatory with radio antennas, forming a 3000 km2 radio array.