Antenna pattern for both vertical and horizontal polarization varies with antenna’s orientation angle. Varying antenna orientation is a common practice with advanced portable wireless devices such as smart phones. This orientation variability affects its effective gain, which has impact on performance of wireless communication system. In this work, we address effective gain variability with antenna orientation. We present the well-known mean effective gain (MEG), instantaneous effective gain (IEG) and stochastic effective gain (SEG). The data series of IEG and SEG is used to extract their statistics as function of the orientation angle.