ABC, 7QLD and WIN in Mackay and surrounds will change frequencies tomorrow.

Areas affected include Nebo, Paget, Eimeo, Glenella, Walkerston, Eton, Finch Hatton, Conway and parts of Proserpine and Sarina.

In Nebo, all channels will change frequencies.

These moves will free up broadcasting spectrum so it can be used for new services such as mobile broadband.

Once the channels have moved, viewers will need to retune their digital TV, set-top box or digital TV recorder to get them back.

Retuning is done using the remote. For most systems, viewers should press the 'menu' button on the remote, look for settings such as 'channels' or 'auto-tuning', then follow the prompts to retune. 

A video and 3-step guide to retuning is available on the website www.digitalready.gov.au/retune.