Why do spacecraft always experience a black-out area that disrupts communications when they return to Earth?

In this paper, Lorentz factor and Lorentz transformations are modified based on the new ether theory, and the blackout which leads to communication interruption of high-speed moving objects is analyzed by using the modified Lorentz electromagnetic field transformation formula. It is concluded that blackout is caused by the change of wave form of electromagnetic wave from stationary energy space (etheric reference frame) to moving medium (etheric reference frame) or from moving medium to stationary energy space.