VLF phase and amplitude measurements made in 1967 at Byrd Station, Antartica, using 18.6-kHz transmissions from NLK, Washington, have been analyzed for lunar-induced and hebdomadal variations. The VLF propagation path was 14,250 km in length and nearly constant in longitude. The lunar-induced variations are found to be ¿18¿ in phase and ¿0.26 dB in amplitude and are explained by height changes in the D region of the ionosphere. The hebdomadal variation in VLF amplitude shows a 0.46-dB increase during the Sunday daylight hours, relative to the Monday-Saturday average, and is ascribed to man-made changes in the D region.