  Studies of medium-induced QCD radiation usually rely on the calculation of
single-gluon radiation spectrum off an energetic parton traversing an extended
colored medium. Recently, the importance of interference effects between
emitters in the medium has been explored. In this work we extend previous
studies by calculating the single-gluon coherent spectrum off an antenna
consisting of a massive quark-antiquark pair. Interferences dominate the
spectrum of soft gluons, which are mainly emitted outside of the cone made by
the antenna opening angle, while the antenna results in a superposition of
independent emitters above a critical gluon energy scale. We study the
interplay between the dead-cone effect and medium-induced jet broadening in
both cases of soft and hard gluons and present results on energy loss
distributions.
