Abstract
Gap-filler (GF) is used to improve the receiving condition in the shaded place as a device which re-transmits a broadcasted wave. But it is difficult to re-transmit to the shaded place only, so it transmits a vertical polarized wave to avoid the interference with the horizontally polarized wave from the master station. However, the Yagi antenna also receive undesired polarized waves, and the attenuation of the undesired polarized wave becomes low depends on the direction of the wave. Therefore, it is expected that the D/U becomes low and the receiving condition becomes bad. In this paper, we describe the results of the field experiments and mention the difference of the influence to the receiving condition depends on the D/U.
