I'm curious about these booster things as well. My freeview is a joke, and irritatingly the digibox worsens the quality of terrestial reception so you cant always fall back on that.
It pisses me off that the govt, ofcom, BBC or whoever is in charge of broadcasting are completely denying the fact that digital TV reception has it's problems. Lets hope that things will be fixed before they turn off the analogue signal for good