For those not in Australia, ABC is the government run broadcaster of Australia (like the BBC in UK) and has local stations in each state's capital city.
891 Adelaide is my local daily radio station, and is usually quite respectable and interesting. Each year it seems to do a decent job with rolling coverage of the TDU. Give it a try.
I think the guys commenting are definitely not experts in cycling, but their hearts are in the right place. Their bread-and-butter is football and cricket. They seem to have been well-briefed when it comes to cycling.
If only for the stage progress and exclusive interviews (stuey o'grady is chatting as I type), 891 ABC Adelaide is worth a listen.