Especially for people living in England:
After long trials, I was able to set up the antenna (45 cm in diameter, elliptical) and receive TV. I have about 86% of the signal strength and only less than 30% of the quality. All channels also work in HD, although the weather is nice and nothing is obstructing the antenna. To be sure, I ordered a round antenna with a diameter of 1.1m - I think that there is no need to save on such things, because whether the storm or the snow should roar.
Now yes - I had the same problem as most of you: signal strength up to 91% 0 quality (this is what I managed to get after long trials). Today I decided to turn the antenna on and it turned out that it was completely wrongly positioned (too east). I will add that I do not use any meter except on the tuner. I noticed that one of the neighbors (because I have several antennas here and each set differently) has the antenna almost completely south, so I took a risk and suddenly the quality jumped 10-20%. I turned gently to the sides, then up and down, then increased the distance of the converter from the dish (on the antenna arm) and finally turned the converter in the handle. I managed to reach 60%. After downloading the list of channels, the quality somehow fell to 28% (I do not know, maybe a cloud or something), in any case chula on this HD. There will be a bigger antenna, it will be more. Remember that the coverage of the Hotbird satellite in Poland is a bit weaker, so you need a larger antenna, but if I caught it at 45cm, I think that with a trained hand and 60cm would be enough in Poland.
That's it. It confused me 91% of the power earlier, so I thought that I set up a great antenna (especially that it wrote HOTBIRD next to it) and it turns out that it is completely wrong, so I moved a lot to the right (almost to the south) and I caught the quality

. Good luck, if what you write this I will try to help.