Ofcom's figures for the second quarter of 2007 show that the digital terrestrial television platform Freeview accounted for 81% of the growth in the digital television market.
The figures are the last set before digital switchover begins in Whitehaven, Cumbria, on October 17 and rolls out across the UK region by region, finishing in 2012.
Almost 1.9m Freeview devices were sold, up from 1.2m in the second quarter of 2006, a 52% rise year on year.
There are now 2.9m homes viewing television on at least one Freeview device, an increase of around 1.2m on the previous quarter.
Sky grew its customer base by 77,000 during the quarter, taking it to nearly 8.1m, with more than 336,000 additions year on year.
The total number of satellite homes reached 9m, including free-to-view satellite viewers.
Sky's high-definition service added 48,000 subscribers, taking the total number to nearly 300,000.
The total number of homes with cable also continued to rise with more than 3.4m subscribers at the end of the quarter. Cable television is in 13.4% of homes, which is its highest proportion since the second quarter of 2004.
Ed Richards, chief executive of Ofcom, said: "More than four in five UK households are now enjoying the benefits of digital television. It's extremely encouraging that we are continuing to see the market grow strongly with less than a month until Whitehaven becomes the first place to fully switch to digital television."
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