Briantist: Brian Winter has posted Not sure of the exact date but it is JUne 2015 that the Yorkshire regional multiplex will http://t.co/e1KvUpmmxA Briantist: David Roberts has posted Stuart Owens All along the s http://t.co/QG9a2JA3DH @servicetechdave @al1304 @dolphin5 @carlyroweis @domrobinson Briantist: tonybrush has posted hi all hope you can help where can I for http://t.co/6LJXJdDLSt @watttyler2 @geofpet @msbluck @theonionator @wayneuk Briantist: Stuart Owens has posted Well not long to go now Bay s http://t.co/k9wwTT1TZL @servicetechdave @al1304 @dolphin5 @carlyroweis @domrobinson Briantist: Steve has posted Not 666 of course meant 66 http://t.co/VPMVgeQXVP @tonyf1966 Briantist: Steve has posted Thanks for replying Mike yesterday my freeview signal showed as 80 signal quality and http://t.co/lP01zuwm6e @tonyf1966 Briantist: KMJ Derby has posted E R Bryan What kind of are you http://t.co/s0qhsRbIz6 @messerstanton @bbcclick @gurucustomers @stevbu @jaynefishwick Briantist: jb38 has posted dibble As your neighbours are apparently able to view EPG 61 without problem you should ask them http://t.co/bEs4w2lCdO Briantist: Mark has posted paul denning The Ofcom licence to broadcast commences on 10th September 2014 so they can http://t.co/oGRvDFYtrc @wally157 Briantist: Andrew Halford has posted I have a question about how Single Frequency Networks operate relating to DAB reception http://t.co/qdAC2wJUM8
The effect on that roof tiles and walls have on analogue TV signals is that the picture will degrade slightly. Making the signal slightly weaker will add a 'snow' element to the picture which is mildly irritating. The picture quality drops, but it is usually possible to make out the picture, as demonstrated here:
Many people have preferred this slight loss in picturequality for the perceived benefits of a loft-mounted aerial. Loft aerials are much easier and somewhat safer to install, and the aerial is shielded from wind and rain that can cause damage to rooftop aerials. In some places (such as New Towns) TV aerials have been previously banned from rooftops.
However, the BBC and others state that Freeviewreception demands a roof-top aerial. The existing (pre Digital Switchover) Freeview signals are at very low power levels. The use by ITV, Channel 4 and five of "64QAM" mode for their transmission multiplexes to provide more channel choice results in a very lower chance of reception of these channels (multiplex 2 is ITV1, ITV2, ITV3, ITV4, CITV, Channel 4, More4, E4, Film4+1; multiplex A carries five, five Life and five US) with a loft-mounted aerial.
By comparison with the image above of how analogue signals look as the signal grow weaker, digital TV reception will continue to give perfect pictures and sound as the power level drops off, until suddenly the level drops below what the COFDM system can cope with. At this point the picture will become blocky and freeze whilst the sound will appear to come and go. Another tiny drop in signal level will result in no picture or sound and a message saying that "no signal is being received". As the signal can vary with weather conditions, people often find that a loftaerial will work when installed and then suddenly stop some months later.
After switchover new digital signals will replace the existing analogue and digital ones. The new digital signals will be at much higher levels that the current ones (for most people) and this will help with reception. However, all six multiplexes will switch to the 64QAMmode that causes the problems indicated above.
Due to our Climate Change commitments (Kyoto Protocol), the signal levels for these new digital will not be as high as those currently used for analogue. For this reason you should not depend on the increase in power levels after switchover compensating for having a loftaerial.
Wherever possible you should use a rooftop aerial. If this is impossible, you may find that connecting your aerial to your Freeviewbox or integrated digital television using satellite-grade coaxial cable will compensate for the loss.
dave simpson: By the way as far as the aerial is concerned, its not so much a case of changing it for a better model but making sure that its positioned as far away from the source of interference as possible, this also applies to the powered booster / splitter.