Youview was a poor choice... A freesat plus box with freetime epg would be better, and would use the dish.
Ah, came with Talktalk? - no alternative to sorting out a usable TV antenna, check the predictors at:
http://www.wolfbane.com/cgi-bin/tvd.exe?
or
http://www.ukfree.tv/transmitters.php
Will show which transmitters should be in range, and direction, antenna polarity.
NB. Unless the receiving device has very poor sensitivity, or splitting the signal to multiple devices, amplifiers at the bottom of the cable do not help much, while a masthead amplifier boosts the signal before some has been lost in the cable.