  This paper focuses on assessing the limitations in the direction-finding
process of radio sources with directional antennas in an urbanized environment,
demonstrating how signal source antenna parameters, such as beamwidth and
maximum radiation direction affect bearing accuracy in non-line-of-sight (NLOS)
conditions. These evaluations are based on simulation studies, which use
measurement-tested signal processing procedures. These procedures are based on
a multi-elliptical propagation model, the geometry of which is related to the
environment by the power delay profile or spectrum. The probability density
function of the angle of arrival for different parameters of the transmitting
antenna is the simulation result. This characteristic allows assessing the
effect of the signal source antenna parameters on bearing error. The obtained
results are the basis for practical correction bearing error and these show the
possibility of improving the efficiency of the radio source location in the
urbanized environment.
