The WPP-owned agency beat Carat in a two-way final round, after the incumbent M2M was eliminated along with ZenithOptimedia, earlier in the pitch.
The process was handled by the AAR, which is also in charge of Freeview's creative review.
The free-to-air digital TV service is preparing a campaign, which will break in the run-up to the crucial Christmas period.
According to Nielsen Media Research, Freeview spent £807,000 on above-the-line advertising during 2006.