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The complex permittivities of the hydrated soil have been measured and the transmission characteristics of the electromagnetic wave in air-hydrated soil boundary have been calculated as the first step of the realization of the landslides prediction system so far. Consequently, it becomes obvious that the reflected wave from the hydrated soil increases as the water content increases and the transmitting wave decreases until it is difficult to measure. Keeping this results in mind, the antenna called EWE at operating frequency of 1MHz has been investigated in order to measure the reflected wave from lands in this paper. The miniaturization and the influence of the conductivity of the ground have been considered.