As most people know by now the change over to digital TV is due to happen in the next couple of years.
This is done by switching all signals from analogue to digital which will then give a much more reliable clear sound and picture quality. You will also be able to view many more channels. The switchover also brings other advancements including interactive services such as the ability to pause live TV.
As this is due to be completed by 2012, we would strongly advise anyone thinking of upgrading to a digital aerial to get it done sooner rather than later as many people who have left it until the last minute may have to wait to have it done due to the huge demand.