Hill: Redknapp has strengthened QPR defence
QPR had leaked 26 goals in 13 games before Redknapp took charge but have conceded just four in as many matches since.
And Hill believes the 65-year-old must take credit for helping shore up Rangers' shaky backline.
"He's changed the shape a little bit and tried to make us more solid through the middle," Hill told the Fulham Chronicle.
"I think performance-wise we have done a lot better in recent games as well and we've got to take the positives from that."