The sizeable attenuation of millimeter waves during rain has apparently inhibited the use of radio links at these wavelengths in the tropics. The advent of high power solid state millimeter wave sources, in recent years, has initiated a renewed interest in millimeter wave links for application in wide band and directive communication links and missile guidance for use even in the tropical regions. For the last few years we have been studying millimeter wave propagation at the atmospheric window on 94 GHz in a tropical location, Calcutta (1at. 22 degree 58'N long. 88 degree 32'E) using LOS links over path lengths up to 1. 5 km. Some of the interesting results obtained during the monsoon seasons of 1985 and 1986 are presented in this paper.