There has been heavy promotion of digital broadcast TV here in Britain. Shutdown of existing analog (625/PAL) transmissions is scheduled to take place region by region, starting later this year and ending in 2012:
http://www.dtg.org.uk/consumer/switchover_map.htmlSix digital multiplexes are being used for DTT in each area.
This page gives an idea of the number of stations broadcast on each UHF channel digital multiplex:
http://www.dtg.org.uk/retailer/dtt_channels.htmlAnd this how the channels have been slotted in around the existing analog channels for most transmitter sites. Tacolneston is my local transmitter, about 25 miles away:
http://www.dtg.org.uk/retailer/tx_ea.htmlSome digital multiplexes are running on reduced power until analog is finally closed down, however, which means that coverage is still not perfect for people a little way from the transmitter. For example, I can receive five of the mutliplexes well enough for good pictures all the time, but multiplex A can be a little weak, enough to give occasional blocking and freezing under certain conditions.
I could hike the antenna up a little more to improve the signal strength for it, but there's only one station on that mutiplex that I would want anyway, and then only very occasionally, so I haven't bothered.