The first QUIJOTE Instrument (or Multi-Frequency Instrument) has four horns, two with receivers at 11-13GHz, and two more at 17-19 GHz. Originally, it was designed with an additional receiver at 30 GHz inside a horn at the center of the focal plane, but this horn was later removed. In total, there are 8 channels in each one of the four frequencies 11, 13, 17 and 19GHz, making 32 channels in total. With the MFI, and after one year of operation, we will reach a sensitivity of 4 µK in the low frequency channels (11-19 GHz), covering a sky area between 5,000 and 10,000 square degrees.