  CoREAS is a Monte Carlo simulation code for the calculation of radio emission
from extensive air showers. It is based on the "endpoint formalism" for
radiation from moving charges implemented directly in CORSIKA. Consequently,
the full complexity of the air-shower physics is taken into account without the
need for approximations or assumptions on the emission mechanism. We present
results of simulations for an unthinned shower performed with CoREAS for both
MHz and GHz frequencies. At MHz frequencies, the simulations predict the
well-known mixture of geomagnetic and charge excess radiation. At GHz
frequencies, the emission is strongly influenced by Cherenkov effects arising
from the varying refractive index in the atmosphere. In addition, a qualitative
difference in the symmetry of the GHz radiation pattern is observed when
compared to the ones at lower frequencies. We also discuss the strong increase
in the ground area subtended by the radio emission when going from
near-vertical to very inclined geometries, making very inclined air showers the
most promising ones for cosmic ray radio detection.
