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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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All trademarks identified by ® or ™ are registered trademarks or trademarks, respectively, of CommScope, Inc. 095022-000 M (05/16)

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