Hi djskutz,
I asked you question on adverts (1Euro offer) about dish - thought dish looked old - realise now totally legit.
After reading thread - just want to let you know - in Maynooth tonight no cloud - using 1.1m Triax & tehnomate 6900 + 0.1db titanium twin - I am getting Viasat Promo Channel 12.378H 27.497 at 81% - this should be good in any weather from my experience.
Can't get anything showing on 11.747 that you mention in thread. My dish is moterised - installed myself at ground level. I set the pole in concrete but didn't get pole perfectly plum so have to tweak slightly up or down to maximise strength. I use a 15 euro signal strength that I think I got in Lidl a few tears ago - it has an audio indicator as well as an analogue hand for fine tuning.
I might be wrong here but I don't think you are using a meter (even as basic as my one) for your set up - a few mils up down or side to side can make a huge difference on my 1.1m.
If there is any Freq you would like me to scan please let me know.