Televisions using Freeview will need to be retuned in parts of South Wales and the Valleys due to the rollout of 4G mobile broadband.
Frequencies that are currently used to transmit the digital TV service will be cleared on March 13th as 4G is introduced to the area.
Engineering work is expected to disrupt TV services from midnight until the late afternoon, with major channels such as BBC One, BBC Two, ITV, Channel 4 and Channel Five being moved to new frequencies.
To combat the problem, viewers will need to retune their television sets. The changes will affect households that receive their signal from the Kilvey Hill and Wenvoe transmitter groups.
Earlier this year, Ofcom predicted that up to 2.3 million homes may be affected by the introduction of 4G.
Many of these people will need to have their TV fitted with a special filter, or even switched to satellite or cable to ensure their service is not disturbed.
Posted by Mark Wynn