Cassini is the only deep space mission to transmit to Earth at three radio wavelengths (approximately 14 cm wavelength, designated S-band; 4 cm, designated X-band; and 1 cm, designated Ka-band) simultaneously.
That says "simultaneously", quite a dish-full.
But there are also a bunch of non-axially located rectangular-waveguide-like objects that are also near the focus of the high-gain antenna system. What are these things for, and are they actually pointed towards the secondary mirror and using it for collimation? I am wondering if this gives some spatial resolution like a giant compound-eye of an insect.
below x2: Screen shots from the animated/simulated part of the montage video Video file: Saturn Plunge Nears for NASA Cassini Spacecraft found on the apparently official JPLraw YouTube channel. The video contains a variety of Cassini-related material, images, and interviews.
above: "A diagram of the Cassini spacecraft and Huygens probe." From here. NASA Jet Propulsion Laboratory. Open in a new window for full size so you can see the detail and read the descriptions!
below: From Handbook of Reflector Antennas and Feed Systems Volume III: Applications of... edited by Sudhakar Rao, Lotfollah Shafai , Satish K. Sharma, screenshot from google books: