The DB404 series is a heavy duty, light weight antenna for
use where an omni-directional or an elliptical radiation
pattern is desired.
GENERAL INFORMATION
OPTIONAL RADIATION PATTERN
DB404 series antennas are designed to allow the antenna
to be configured to meet changing coverage requirements.
When the dipole element pairs are spaced at 90° to each
other, an omni-directional or circular pattern is achieved.
When both sets of dipoles are in line (collinear), the
antenna exhibits a directional characteristic, offering an
elliptical pattern. See Figures 1 and 2. Figure 3 shows
gain variation for omni and elliptical antennas.
By loosening the banding clamps that hold the dipole
elements against the mast and the tape securing the
antenna harness to the mast, the top elements can be
rotated around the mast as shown in Figure 1 to easily
change the pattern shaping. Clamps must be securely
tightened and the antenna harness re-taped to the mast
(covering the tape that secures the cabling harness to the
mast with an aluminum backed tape such as Scotch #425)
when adjustments are complete.
GENERAL MOUNTING INFORMATION
These antennas can be mounted on the top of a tower or
to a wooden pole. For best operation, it is recommended
that the bottom dipole be above the tower. Side mounting
of the antenna requires the use of a DB5007 side mount
kit. Radiation patterns obtained with the antennas side
mounted on a 18" tower are shown in Figure 4.
(continued on page 2)
Do not install on a wet or windy
day or when lightning or thunder
is in the area. Do not use metal
ladder.
Do not install near power lines.
Power lines, telephone lines,
and guy wires look the same.
Assume any wire or line can
electrocute you.
Wear shoes with rubber soles and
heels. Wear protective clothing
including a long-sleeved shirt and
rubber gloves.
SAFETY NOTICE
The installation, maintenance, or removal of an antenna
requires qualified, experienced personnel. CommScope
installation instructions are written for such installation
personnel. Antenna systems should be inspected once a
year by qualified personnel to verify proper installation,
maintenance, and condition of equipment.
CommScope disclaims any liability or responsibility for the
results of improper or unsafe installation practices.
It is recommended that transmit power be turned off
when the field installation is performed. Follow all
applicable safety precautions as shown on this page.
Figure 1. Dipole Arrangement For Pattern Performance.
Omni
Elliptical
Figure 2. Azimuth Pattern with Respect to Half Wave Dipole.
Broadband Antennas
DB404 Series
095022-000 Revision M, May 2016
Page 1 of 2
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