It is a misconception that a Wideband aerial is 'always' best for Digital reception. For instance, from the Whitehawk Hill (I don't know if that's your local transmitter), all digital multiplex's are in the group C/D range anyway (vertical polarisation), in which case a group C/D aerial would give better results.
Check here for correct group and polarity.
In the end it usual does work out cheaper to have an experience aerial installer, first as last.
Cobweb
April 2007