  We compute the color coherence effects for soft gluon radiation off antennas
containing heavy quarks in the presence of a QCD medium - in color singlet,
triplet or octet global states. This work completes the studies of antenna
radiation inside a medium which provide a useful picture of the relevance of
interference effects in jet parton showers for the jet quenching phenomenon
observed in high-energy nuclear collisions. The analysis is performed resumming
the multiple scatterings of the partonic system with the medium. The main
conclusion is that decorrelation due to color rotation is more effective in the
case in which at least one of the emitters of the antenna is a heavy quark.
This effect, present both for a heavy-quark-antiquark or a heavy-quark-gluon
antenna is more relevant for the later or for the case in which the energies of
the quark and antiquark are very different. The parameter controlling these
effects involves the dead-cone angle. We find that interferences are cancelled,
spoiling the color correlation of the pair, when $\theta_{ DC}=M/E
>>1/\sqrt{\omega L}$ where E and {\omega} are the energies of the heavy quark
and the radiated gluon and L is the medium length. In the case of a
heavy-quark-antiquark antenna $t_{form}$ appears instead of L if the original
splitting is symmetric. The presence or absence of interferences modifies the
energy loss pattern.
