[CutX]

indeed, it is possible.
As long as you have a URL leading to a playable sound file/stream that is.

but well, im not 100% sure if it'll work.
what if iTunes radio exchanges some kind of acknowledgement between it and the client
before playing, ensuring that the client is a "valid" client for iTunes radio?
you gotta try and play around, noone can say 4 sure until they figured it out :/

edit: apple says it requires iTunes 11.1 (or later)
so i bet there is some kind of acknowledgement exchanged, ensuring that
the request was made by an iTunes client.