There are communication problems among the wearable devices. One of the solutions is “Intra-Body Communication” which uses the human body as a communication media. However, the body has different response for different frequencies. This paper is trying to find out the frequencies that will have the minimum loss when passing a body by experiments. The experiments are using a pair of electrodes to inject 1V peak to peak signal of different frequencies into the forearm and to retrieve the signal from the other end. The data shows that lower loss appear at around 40MHz.