Freeview viewers in Wirral will need to retune their TV on March 7 to continue watching some programmes.
Some channels will be moving to new airwaves to allow development of new mobile broadband services.
After a decision made by the Government, transmitters across the UK will be updated region by region as part of a major engineering programme.
The changes will begin at the Winter Hill transmitter, which serves 2.6m homes around Merseyside and Cheshire, after midnight on March 7.
Some Freeview channels will be off-air overnight until 6am, after this any viewers receiving their TV signal from Winter Hill can retune.
Satellite and cable TV services will not be affected.
Freeview will also be running an information campaign to prepare people for the change, including advertising and on-screen messages.
Further updates will take place at Winter Hill in the next two years as engineering work is completed in neighbouring areas, freeing up airwaves to allow other essential changes.
Viewers will see a reminder to retune on their TV screens if they are affected.
Anyone who needs advice on how to retune or who finds they are still missing services after retuning, can visit www.freeview.co.uk/tvchanges or call the Freeview Advice Line free on 0808 100 0288.
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