![The Gregorian Dome reflector and delay line feed antenna is suspended 490 feet above the radio telescope dish of the Arecibo Observatory in Puerto Ric Stock Photo - Alamy The Gregorian Dome reflector and delay line feed antenna is suspended 490 feet above the radio telescope dish of the Arecibo Observatory in Puerto Ric Stock Photo - Alamy](https://c8.alamy.com/comp/2CCBG5J/the-gregorian-dome-reflector-and-delay-line-feed-antenna-is-suspended-490-feet-above-the-radio-telescope-dish-of-the-arecibo-observatory-in-puerto-ric-2CCBG5J.jpg)
The Gregorian Dome reflector and delay line feed antenna is suspended 490 feet above the radio telescope dish of the Arecibo Observatory in Puerto Ric Stock Photo - Alamy
Feasibility Study of a W-Band Multibeam Heterodyne Receiver for the Gregorian Focus of the Sardinia Radio Telescope
![Listen to Gregorian - Still I`m Sad by Radio Indie International Lounge Network in next list playlist online for free on SoundCloud Listen to Gregorian - Still I`m Sad by Radio Indie International Lounge Network in next list playlist online for free on SoundCloud](https://i1.sndcdn.com/artworks-000119089838-m3lxtc-t500x500.jpg)
Listen to Gregorian - Still I`m Sad by Radio Indie International Lounge Network in next list playlist online for free on SoundCloud
![Radiotelescope of Arecibo - Puerto Rico - View of the Gregorian dome and antenna. The world's largest radio telescope, 305m diameter antenna by Radiotelescope of Arecibo - Puerto Rico - View of the Gregorian dome and antenna. The world's largest radio telescope, 305m diameter antenna by](https://images-cdn.bridgemanimages.com/api/1.0/image/600wm.PIX.38845640.7055475/4651704.jpg)