The linear dispersion relation of the beam-plasma instability and the ISEE 1 wave observations in the electron foreshock are examined in order to study the existence of broadband emissions polarized in an oblique direction with respect to the direction of the electron beams reflected from the bow shock. The present work focusses on broadband emissions observed above the electron plasma frequency &ohgr;pe, in the frequency range -1.5 &ohgr;pe and above. The linear dispersion relation of waves is investigated numericall and the dependence of the unstable frquency bandwidth on the beam to plasma temperature ratio, Tb/Tp, and density ratio, Nb/Np, is studied. It is shown that electron plasma waves can initially grow in an oblique direction up to 2.5 &ohgr;pe and above, when the beam temperature is low, Tb/Tp below 10-2, and its density close to or above Nb/Np=0.01. The unstable frequency bandwidth over which emissions can grow is shown to be highly controlled by the density ratio Nb/Np. The statistical study of the directivity of broadband emissions observed by ISEE 1 supports the existence of oblique emissions in the frequency range 1--1.5 &ohgr;pe, whereas the emissions with frequencies close to &ohgr;pe propagate mainly in the parallel direction. ¿ American Geophysical Union 1990