The Sardinia Radio Telescope is the largest Italian Telescope, located in San Basilio near Cagliari. This telescope was built after the one in Medicina near Bologna and the one in Noto near Siracusa and it is the most technologically advanced.
As well as the LSPE-STRIP feed-horn corrugated hexagonal foils, the self centering rings (image SRT_01 and SRT_02), appropriately assembled, will make up the rank of corrugated feed-horns of the new 40 Ghz receiver. Every ring is machined with extreme accuracy to guarantee the perfect symmetry of feed-horns during assembly, in order to avoid undesired spurious effects during the observation of the sky. http://www.srt.inaf.it/