The service will also be broadcast on big screens in Brisbane and the Sunshine Coast, and into Asia and the US.
But the article doesn't give specifics or details. They're probably still working it out.
612 broadcasts Steve Irwin's memorial service
On Wednesday, 20 September, 612 ABC Brisbane will be broadcasting from Australia Zoo from 8.30am, to bring you the memorial service live from 9.00am.
I'm guessing that Animal Planet may not even be set up for a live broadcast? Seems like they'll be a good place to look for info, but that the actual broadcast would be on another channel, as mom4kittys mentioned.