I am experiencing very poor signal strength on Sky 3 and UKTV History (there may be a couple more channels below par as well but these are the most noticeable). They are really so bad that they are unwatchable, Sky 3 in particular. I never used to have this problem as the History channel was one I regularly watched. I live in a good reception area only about 20 miles from the Black Hill transmitter and all other channels show a strong signal, I have carried out a completey new installation scan to no avail. Anyone know why these two should be so badly affected?