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It is well known that the propagation characteristics are changed for wireless communication. We have investigated the characteristics of radio wave for indoor wireless communication in a typical Malaysian office environment. It is not too far when a lot of Malaysian people will use their personal computer or lab top in the office for signal transmission through an indoor wireless link. The transmitted signal is attenuated by the different materials used in the office such as partitions, cabinets etc. The transmitted signal is also changed due to the difference of transmitting and receiving antenna heights. We conducted our investigation in a room of about 7 m ×15 m size. We put different obstacles in between the transmitter and receiver. The experiment was conducted at the different levels of a 5-storey building. Our investigation shows that signal strength changes with different materials used in the office as well as the location of the transmitter and receiver. We have used different frequencies for the transmitted signals.