Freeview viewers in Dumbarton and the Vale may need to re-tune their TV equipment in the coming weeks to continue watching some programmes.
This is because some Freeview channels are moving to new airwaves to allow for the future development of new mobile broadband services.
Following a decision by the UK Government, transmitters are being updated region by region as part of a major engineering programme being carried out between now and 2020.
The main required changes will take place at the Black Hill transmitter group, North Lanarkshire on September 5 and October 3.
On both dates, engineering work will begin shortly after midnight and Freeview channels will be off air overnight until 6am.
After this, any viewers receiving their TV signal from the main Black Hill transmitter who find they are missing channels can re-tune.
Services from smaller local transmitters may be subject to disruption until late afternoon.
Around one million homes across the central belt are served by the affected transmitters.
Anyone who needs advice, or who finds they are still missing services after re-tuning, can visit: www.freeview.co.uk/tvchanges or contact the Freeview Advice Line free on 0808 100 0288.
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