PURPOSE: To reduce trouble of installation and installation space by arranging a reception section for high frequency to the center of a radio wave focusing location and arranging the reception section for low frequency near the location.

CONSTITUTION: In case of receiving a radio wave of a high frequency, the radio wave is reflected in a reflection mirror 4, received by a reception section 21 for high frequency, and in case of receiving a radio wave of a low frequency on the other hand, the radio wave is in the reflection mirror 4, and received by a reception section 22 for high frequency. Since two frequencies (high and low) are received and the reception section 21 for high frequency and the reception section 22 for low frequency are both arranged at the focusing location of the radio wave by means of the one reflection mirror 4, one reflection mirror 4 requiring a large volume is enough for the antenna. Thus, the trouble of installation and the installation space for a bulky reflection mirror are saved.