WISCO International (Decibel Products / Dipoles DB404)

The DB404, with its 2-stack collinear array of dual dipoles, provides a broad bandwidth that allows the antenna to be ordered in advance of frequency assignment.

Extremely Rugged - Resists wind to 125 mph (201 km/hr)
Broad Response - With 14 to 24 MHz bandwidth, DB404 is highly suitable for duplex operation.
Moisture Resistant - VAPOR-BLOC® cable harness provides weather protection and assures inphase signal distribution to all elements.
Circular Pattern - DB 404 has the dual dipoles at the top aligned at a 90 degree angle from the dual dipoles at the bottom.
Offset Pattern - DB404L has all dual dipoles in line, collinearly, along the mast.
Side Mounting - Either model can be side mounted, resulting in significantly different patterns.
Field Changeable - Patterns can be adjusted with ordinary hand tools.
Lightning Resistant - The radiators operate at DC ground and the aluminum mast with its pointed cap provides a low resistance discharge path to the tower or ground system.

Ordering Information - Use model number for correct frequency and specify termination if non-standard. Order DB404 for omni pattern, DB404L for offset pattern. DB365-OS Clamps are included. Order DB5007 Side Mount Kit if needed. Other size clamps can be special ordered.
Example: DB404-B, DB404L-B for 450-470 MHz range. Order jumper cable separately, if desired.

Electrical Data
Frequency Ranges - MHz	A = 406-420 B = 450-470 C = 470-488 D = 488-512
Bandwidth - MHz VSWR	Same as above 1.5 to 1 or less
Nominal Impedance - ohms Gain (over half-wave dipole)	50 3.8 or 5
Rated power input - watts Vertical beamwidth (half power)	250 27°
Lightning protection	Direct ground
Standard Termination: Captive Type N-Male attached to end of flexible lead. Other fittings are available on special order. N-Female available. If UHF connector is required, an adaptor is provided.

Mechanical Data
Mast - (aluminum) - in. (mm) Radiating elements (aluminum) - in. (mm)	1.75 (44.45) OD with .125 (3.175) wall .375 (9.525) OD with 0.58 (1.473) wall
Maximum exposed area (flat plate equivalent) - ft² (m²)	1.14 (28.96)
Wind rating:* Survival without ice - mph(km/hr) Survival with .5" (12.7 mm) radial ice - mph (km/hr)	over 125 (201) over 125 (201)
Lateral Thrust at 100 mph (161 km/hr) - lbf (N)	45.6 (202.8)
Bending moment at top clamp at 100 mph (161 km/hr) - ft. lbs. (kg m)	62 (8.58)
Overall Length - ft. (m) Net weight (w/clamps) - lbs. (kg) Shipping weight (w/clamps) - lbs. (kg)	5 (1.52) 14 (6.35) 24 (10.89)
Mounting clamps (Galvanized Steel)	DB365-OS