The principal advantage of this met

The principal advantage of this method is that the bearing
is indicated without delay, which means that it is capable
of monopulse direction finding over the entire azimuth
range.
Suitable antennas (Fig. 9) with sine-shaped or cosineshaped
directional patterns are in particular the following:
JJ Loop antennas (or ferrite antennas)
JJ Adcock antennas (monopole or dipole arrays)
Crossed-loop antennas with Watson-Watt evaluation are
mainly suitable for mobile applications due to their compact
size. They feature the following benefits and drawbacks:
JJ Benefits:
WW Extremely short signal duration is sufficient
WW Implementation is simple
WW Minimum space is required
JJ Drawbacks:
WW Small-aperture system (D/λ < 0.2) causing errors
in case of multipath propagation
WW Large DF errors when receiving sky waves with steep
elevation
angles