  HD 133880 is one of the six hot magnetic stars known to produce coherent
pulsed radio emission by the process of electron cyclotron maser emission
(ECME). In this paper, we present observations of ECME from this star over a
wide frequency range, covering nearly 300 - 4000 MHz with the Giant Metrewave
Radio Telescope (GMRT) and the Karl G. Jansky Very Large Array (VLA). This
study, which is the first of its kind, has led to the discovery of several
interesting characteristics of the phenomenon and also of the host star. We
find that the observable properties of ECME pulses, e.g. the time lag between
right and left circularly polarized pulses, the amplitudes of the pulses, and
their upper cut-off frequencies appear to be dependent on the stellar
orientation with respect to the line of sight. We suggest that all these
phenomena, which are beyond the ideal picture, can be attributed to a highly
azimuthally asymmetric matter distribution in the magnetosphere about the
magnetic field axis, which is a consequence of both the high obliquity (the
angle between rotation axis and the magnetic field axis) of the star and the
deviation of the stellar magnetic field from a dipolar topology.
