A microstrip antenna is well suited for wireless application due to their low weight, low volume, and low sensitivity to manufacturing tolerances. In the recent years, communication system often requires multiband antennas to avoid the use of different antennas. In this paper, multiband characteristic of two layers stacked different shapes geometries (Circle, Pentagon, Hexagon, Octagon) microstrip patch antenna is experimentally studied. It is a probe feed antenna for impedance matching with 50Ω coaxial cable. This antenna works well in the frequency range from 0-10GHz. The variations in the shapes likes circle, pentagon, hexagon and octagon of the stacked microstrip patch antenna have been analyzed, and it is found multi resonance with decreasing lower resonance frequency with changes in its shape. The return loss, directivity and gain have been measured with the help of IE3D Zealand software.