Tv off for work on the mast.
And further blackouts are likely for millions of TV viewers over the next few days - and possibly into August.
Viewers in Fixby, Almondbury, Honley and Birchencliffe contacted the Examiner when they suddenly lost pictures and sound yesterday morning.
The problem affected BBC1, BBC2, ITV, Channel 4 and Five.
People viewing the channels via cable and satellite were not affected.
A spokesman for Arqiva, the company which owns the 1,084ft mast, said the disruption was due to essential work being carried out to aircraft warning lights on the mast.
He said the company had scheduled four days for the work to be carried out by its engineers.
Arqiva had agreed with broadcasters to carry out the work between July 24 and August 4, but had not specified on which days the work would be done.
"The work may not be done on consecutive days," said the spokes- man. "It will depend on factors such as the weather."
He added that it was a matter for the broadcasters to decide whether or not to tell viewers about possible disruption.