Dvb-t picture quality.

[Burnzybubbles]

Can anyone shed some light on why my picture is very pale on the screen? I'm not sure yet if it's an aerial issue and as per my other thread I've a S/H replacement turning up for that, one other thing I can think of is maybe give the most connections a clean with some isopropanol and make sure their spotless, does anybody know what controls the picture? As normal the screen is vibrant, it's a bit hit and miss when on TV and this is what makes me believe it's a signal thing but then it's a digital signal so kind of scratching my head