PURPOSE: To prevent an obstacle comes from rain water by providing antenna elements on roof materials so as to form the radiation elements of a dipole antenna, and also providing a connector for connecting the antenna elements to a receiver on the top part side of the roof material.
CONSTITUTION: Facing to the coming direction of electric wave, roof materials 4a, 4b, 4c are arranged so that an antenna element 13 for a waveguide element, antenna elements 6, 7 for radiation elements, and an antenna element 14 for a reflection element are arranged in the order. Next the connector 8 of the elements 6, 7 are positioned under the roof material 4 on the upper step side, so as not to be splashed with rain water and the like. The electric wave of TV broadcasting and the like is guided toward the elements 6, 7 by the element 13, reflected by the element 14 toward the elements 6, 7 by the element 14, and received by the elements 6, 7. Hereby, the occurrence of electric wave janiming comes from rain water stuck to the connector can be prevented, invasion of rain water into the receiver from the connector through a feeder, and the receiving efficiency and the antenna directivity can be improved so as to reduce ghost.
TAKERA HIROSHI
SUEYOSHI YASUNORI
MIZOGUCHI TAKAHIRO
NIIMI YASUSHI
