A spacecraft loses all forms of communication,including global positioning system signals,data telemetry,voice communication and so on,when it enters the communication blackout phase.This becomes more and more critical with the development of reentry vehicle missions since radio blackout brings about many serious issues related to vehicle safety.This paper studies the influence of magnetic field on antenna performance in plasma.The results indicate that the effect of plasma on the antenna performance can be negligible when the magnetic field reaches a certain strength.This provides another way to solve the reentry blackout problem. A spacecraft loses all forms of communication, including global positioning system signals, data telemetry, voice communication and so on, when it enters the communication blackout phase. This becomes more and more critical with the development of reentry vehicle missions since radio blackout brings about many serious issues related to vehicle safety. This paper studies the influence of magnetic field on antenna performance in plasma. The results indicate that the effect of plasma on the antenna performance can be negligible when the magnetic field reaches a certain strength. This provides another way to solve the reentry blackout problem.