An antenna device 10 comprises azimuthal range antennas in which an upward directivity antenna 21 is paired with a downward directivity antenna 22, and different sector antennas in which an upward directivity antenna 23 is paired with a downward directivity antenna 24. The silica-forming raw material gas is hydrolyzed to form fine particles of silica, which particles are deposited on a rotatable substrate so as to form a porous silica matrix, which is then fused to give the quartz glass. The mesh body has a porosity sufficient to permit water to pass therethrough but insufficient to permit mortar and other debris to pass therethrough to weep holes or other water channels covered by the collection debris. The user station includes means for receiving the stream of data and a plurality of speakers for recreating the sounds of the remote location. Thus, the overhead for allocating the access time for the external bus is no longer required.