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Blazars are powerful, variable emitters from radio to gamma-ray wavelengths.Even though the general picture of synchrotron emission at low energies andinverse Compton at the high energy end is well established, many importantaspects of these remarkable objects are still not well understood. For example,even the location of the gamma-ray emission region is still not clearlyestablished, with some theories locating it close to the black hole/accretiondisk while others place it at parsec scales in the radio jet. Since mid-2007 wehave carried out a large scale monitoring program at 15 GHz using the OVRO 40 mtelescope. We are currently observing about 1700 blazars twice per week. Thesample includes all the Fermi-LAT detected blazars north of declination -20degrees. Here, we study the existence of correlated variability between thesetwo bands for 86 sources bright enough to be detected weekly by LAT. Theexistence of correlated variability can be interpreted as an indication of arelated spatial locations for the radio and gamma-ray emission, making theevaluation of its statistical significance a key goal of our program. A studyof the statistical significance of these cross-correlations is presented alongwith a discussion of the Monte Carlo simulations used to evaluate them. Moreinformation about the conditions on the radio emission zone can be obtainedthrough polarization monitoring which tells us about the configuration of themagnetic fields in this region. To study radio polarization variability we arebuilding KuPol, a radio polarization receiver for the 12 to 18 GHz band thatwill replace the current total power receiver at the OVRO 40 meter telescope.

OVRO 40 m Blazar Monitoring Program: Location of the gamma-ray emission  region in blazars by the study of correlated variability at radio and  gamma-rays