We recommend using the area code for the capital city in your state/territory (in your case, 4000), but I don't know if changing that will be enough to fix your issue with not finding channels.
When you say "cannot find any channels" do you mean your channel list is empty or you can't see anything broadcast on the screen when you ask for Live TV or you don't have any guide data?
Have you checked the antenna cable by plugging it into a regular TV instead of your TiVo?
Have you tried the suggestions in Messages & Settings > Troubleshooting?
You could also check that System Information says that your Dial-in Configuration Code is set to 140, and check whether your network connection is working.
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