The ABC's radio and TV networks have sustained heavy damage from the bushfire crisis across NSW and Victoria, forcing the national broadcaster to call on the military, commercial media rivals and members of the public to maintain emergency broadcasting.

With a range of radio and TV services knocked out in parts of the country, the broadcaster has been mobilising to restore local radio stations as the priority because of their critical role in providing information to communities during disasters.

Broadcast towers remain the "weakest link" during emergency broadcasts, the ABC's head of content management Rebecca Matthews warned, because the infrastructure is vulnerable to fires.

The hardest hit areas during this catastrophic bushfire season have been Batemans Bay in NSW and East Gippsland in Victoria.