The last component of BorealScat’s radar system has been installed and long-term time series measurements have been initiated. This includes an additional, smaller antenna array consisting of 10 dual-polarised (H and V) antennas, allowing fully polarimetric tomographic profiles of the forest below at C-band (5200-5600 MHz). The measurements from this system will help to improve our understanding of electromagnetic scattering mechanisms in boreal forests at C-band and their variation with environmental parameters. This work is funded by the European Space Agency (ESA).