The beaconing antenna downward-looking wave of the short-range tactics navigation reflect because of the surface around, after adding the direct wave, its intensity is peak-valley distributed by the distance, and the airplane located in the valley area might lose the navigation signal causing by the too weakness signals. Based on beaconing/ airborne antenna height, direction chart characteristic, ground-to-air distance and the surface reflection, the peak-valley distribution is described in this paper. The influences on each parameter are analyzed, and the options of softening the reflection are concluded.