We present here cases of wide banded Non Thermal Continuum (NTC) observed from the multi-point Cluster observatory. We point out that a large portion of the plasmasphere boundary layer, covering magnetic latitudes from 0 to above 30°, is radiating these radio waves. The radiation is confined inside multiple beams of small cone angles. We show how the spectral signature evolves, from integer harmonics of the electron gyrofrequency, when the observatory moves away from their sources.