We have completed observations for a project to examine large-scale magnetic fields pervading regions of high-mass star formation. Through correlating targeted observations of ground-state OH maser emission towards more than 500 sites of high mass star formation, this project aims to test if the orientations of weak large-scale magnetic fields can be maintained in the contraction (and field amplification) to the high densities encountered in regions of high-mass star formation. Our observations were made with the Australia Telescope Compact Array, using the new broadband backend, to capture all four ground-state transitions in full polarisation simultaneously. These observations were made towards sites of high-mass star formation traced by 6.7-GHz methanol masers detected in the Methanol Multibeam Survey. I will discuss the detections, local- and large-scale magnetic field properties and the implications for the role of magnetic fields in high-mass star formation.