In a multi-sectional air enclosure, an air filling passageway is formed between two outer films folded together and in the meantime, a plurality of air cylinders are formed by adhering the two outer films to each other by means of hot sealing, each air cylinder is adhered to form into a plurality of air chambers in series by means of hot sealing. The first decoder decodes the provided frame and outputs the decoded frame. The radar apparatus includes a controller. The gasket is previously secured to the mirror base by a screw.