3) The ice sheet has very good radio transmission properties so when a neutrino does interact with the ice, producing a meuon and the resulting RF pattern it can be more easily detected.
probably a stupid question, but I'll ask anyways.
I thought most radio telescopes had some sort of parabolic reception dish?
If you were looking directly for the RF (i.e. "Contact" with Jodie Foster), then yes. But in this case, they are looking for neutrenos, a sub-atomic particle. They aren't directly detectable due to their lack of general interaction. But if they collide, there is a shower of other particles created and a resulting RF burst. The RF travels outward in the shape of a cone (also light and sound is created). It is the RF cone they detect, triangulate and then project backwards to the source of the particle.
Neutrenos are produced in the sun, the Earth's atmosphere, supernova, the big bang, even in the small amount of radioactive decay occurring continuously in your body. But these guys want to see the really high energy ones, ones made in supernova, the big bang and other unknown phenomena. Because they are such high energy to begin with and are not affected by magnetic fields, they travel in straight lines and act like pointers back to their source.