VHF radars have evolved as powerful tool for monitoring Earths atmosphere. It has several advantageous over other techniques as they provide observations with high temporal and vertical resolutions. Most advantage is providing 3-D wind fields particularly the vertical wind which made it unique among other techniques. These radars are effectively utilized for basic atmospheric research besides its operational applications (forecasting, aviation, wind support for rocket launches and air quality meteorology). Fundamental research includes boundary layer processes, turbulence, wave dynamics, stability of the atmosphere, retrieval of temperature and humidity, tropical tropopause layer characteristics, stratosphere -troposphere exchange processes, Indian summer monsoon dynamics (low level jet, tropical easterly jet, monsoon circulation), Hadley circulation, mesospheric and ionospheric dynamics, lower, middle and upper atmosphere coupling processes. Present talk summarizes all these applications. It also covers identification of few gap areas while using network of such radars (existing and upcoming) and adding complementary techniques.