1) The document describes a ground penetrating radar (GPR) survey conducted at Universiti Sains Malaysia to analyze electromagnetic wave signals in different subsurface media (asphalt, air, and concrete). 2) GPR data was collected using a 250 MHz antenna and processed using filtering and plotting software. Graphs of amplitude versus time showed differences in the period of the first wavelet for each medium. 3) The results found that air had the shortest period of 53.04 ns, indicating it had the highest velocity for EM wave propagation. Asphalt and concrete both had longer periods, corresponding to slower velocities.