On military vehicles an antenna DDRR usually places
on one of edges as it is shown in Figure 5. It allows to install
other antennas on the roof of the communication car. Antennas
DDRR often serve as enclosure of the roof.
5 Antenna DDRR
on military vehicle
Antennas DDRR also are used on some heavy tanks or
BMI (battle machine of infantry). On this military vehicle the
antenna DDRR serves as a rail for other hand. Antenna DDRR has
mechanically strong design, so it is difficult to damage an antenna
DDRR in battle.
use two antennas DDRR that fed with some phase shift to create special
diagram directivity. Figure
6 shows such antenna array.
6 Array of antennas
Antenna DDRR is very strong and allows to do communication when the car is moving. Radio amateurs
also can use antenna DDRR for the operation in ether at installation
on the roof of their car.