The wavefront of the radio signal emitted by cosmic ray air showers

W.D. Apel;J.C. Arteaga-Velázquez;L. Bähren;K. Bekk;M. Bertaina;P.L. Biermann;J. Blümer;H. Bozdog;I.M. Brancus;E. Cantoni;A. Chiavassa;K. Daumiller;V. de Souza;F. Di Pierro;P. Doll;R. Engel;H. Falcke;B. Fuchs;H. Gemmeke;C. Grupen;A. Haungs;D. Heck;J.R. Hörandel;A. Horneffer;D. Huber;T. Huege;P.G. Isar;K.-H. Kampert;D. Kang;O. Krömer;J. Kuijpers;K. Link;P. Łuczak;M. Ludwig;H.J. Mathes;M. Melissas;C. Morello;J. Oehlschläger;N. Palmieri;T. Pierog;J. Rautenberg;H. Rebel;M. Roth;C. Rühle;A. Saftoiu;H. Schieler;A. Schmidt;S. Schoo;F.G. Schröder;O. Sima;G. Toma;G.C. Trinchero;A. Weindl;J. Wochele;J. Zabierowski;J.A. Zensus