Fire fighters are trying to contain a bushfire near Coonabarabran to stop it threatening a radio and television transmission tower.

The fire has been burning in the Warrumbungle National Park in north west New South Wales since Sunday night.

The tower broadcasts local FM radio as well as ABC and commercial television channels.

Audience liaison manager Kevin McAlinden says the site has been prepared in case it is hit by the fire.

"There's no alternative for ABC TV but we're putting preparations in place to try to reduce the impact of the fire as much as possible if it does go through the transmitter site," he said.

Mr McAlinden says there are other frequencies people in the Coonabarabran area can tune into.

"If our local radio transmitter goes down then we would encourage people to tune into 549 AM or possibly 99.1 FM or 648 AM depending on where they live," he said.