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Due to extreme inclement weather SteppIR Communication System’s business hours may vary.

DB36 Yagi Antenna

The DB36 is part of the DB series Yagi antennas that use loop elements for 30 and 40M performance. The DB36 packs MonstIR performance into an antenna that turns in nearly half the radius, and is almost half the weight.   The DB36 is unique among the DB series antennas in that it has a single feed line, and no relays inside the EHU’s.  The DB36 has a 49 ft looped driven element.  This patented design allows us to make the end loop elements only 39 feet long, yet the performance is as if all 3 of the loop elements are 49 feet long.  The folded dipole loop technology lets the footprint be 40% less than that of the MonstIR Yagi, losing only 0.4dB in gain performance.

The DB36 has a optional 80M dipole that works with the SDA100 controller for effortless tuning 6M through the entire 80M band.  The dipole runs parallel to the boom and uses the end elements as capacity hats, creating zero interaction with the rest of the antenna.


DB36 Visalia
DB 36 Yagi at Visalia International DX Convention



Specification DB36 DB36 with 80m
Dipole Option
Boom Length 36 ft / 10.97 m  No change
Boom 1.75 – 2.5 in
4.45 – 6.35 cm
No change
Longest Element 49 ft / 14.9 m No change
Turning Radius 26 ft / 8.0 m No change
Weight 160 lb / 72.8 kg 164 lb / 74.39 kg
Available saddles for mast
(2.0 in / 5.08 cm is standard)
1.75, 2.0, 2.25, 2.5, 3.0 inch
4.45, 5.08, 5.72, 6.35, 7.62 cm
No change
Wind Load 17.5 sq ft / 1.63 sq m No change
Wind rating 100 MPH (EIA-222-C) No change
Adjustable elements 4 No change
Power Rating (40m-6m) 3 KW (80m) 1.5 KW
Feed points 1 1
Frequency coverage 6.95 – 54 MHz 3.5 – 4MHz, 5.3MHz, 6.95 – 54 MHz
Tuning Rate 1.3 ft per second No change
Control Cable 16 wire 22 AWG shielded 24 wire 22 AWG shielded


Performance for Ham Bands DB36 Gain DBi DB36 Front to Rear, DB
80M 1.35 n/a (pattern at right
angle to elements)
40M 7.2 21
30M 8.2 18
20M 9.3 22
17M 9.9 27
15M 10.2 27
12M 10.4 21
10M 10.7 11
6M – 4 elements 4 2
6M – with optional passive
element 50.0 – 53.3 MHz
12.8 27



Product Features


(click for  detail)
 DB36  00436 DB36 40m-6m:  DB36 Yagi antenna, includes 2x 39 ft loop elements, 1x 49 ft element, 1x 36 ft straight element, 36 ft boom, 160 lb, 6.95 MHz – 54 MHz continuous frequency coverage; Includes basic SDA100 electronic controller, Connector Junction Box.  Optional 80m dipole available.
 SDA 100  09128 SDA100 Controller: Standard for all antenna models; Basic controller includes: 180 degree mode, bi-directional mode, auto-retract, manual band change, manual adjustment of elements.   CLICK HERE   for the Electronic Controller Information page
Transceiver interface  01321 OPTIONAL Transceiver Interface for SDA100 controller:  Automatically adjusts each element of the antenna as the radio tunes.  Requires a transceiver interface cable.  CLICK HERE to see which interface cable you will require for your radio.
 Tuning Relay  01322 OPTIONAL Tuning Relay for SDA100 controller:  Lock-out relay connects via PTT cable to RF power source and prevents the amplfier from transmitting while the SteppIR antenna is being tuned.  Helps prevent potential mismatch issues that could damage the antenna.
 ALP Module  09130 OPTIONAL Advanced Lightning Protection (ALP) Module for SDA 100 electronic controller:  Each driver chip has a relay in front of it that protects against lightning, nearby lightning incident and dead shorts.  Module will only work if the antenna is not in the process of adjusting when the event occurs.
 Remote Driver Board  09132 OPTIONAL Remote Driver Board for SDA 100 electronic controller:  The remote driver board is mounted near the tower base.  16 conductor control cable is run from antenna to the remote driver board, and then CAT5e cable can be used to connect from remote driver board to hamshack, up to 2000 feet away.  Requires a power source.  Advanced lightning protection (ALP) module is included with this option.  Remote driver board comes with an aluminum mounting plate but does not come with an enclosure.
 80m Dipole DB36 01811  OPTIONAL 80m Dipole kit: This option adds a wire dipole that runs parallel to the boom, using the end loop elements for capacity hats.  Adds coverage for 3.5-4 MHz & 5.3 MHz.  Performance is only 0.8dB down in gain from a full sized 80m dipole and there is zero interaction with antenna and no wind load added.
 Element truss kit 01603  OPTIONAL Element truss kit, end elements: Element trusses for loop element.  Because the loop elements droop lower than the non-loop elements, this option allows a more uniform appearance of all the elements. Does not improve wind or ice load limits. For appearance only.  There are two sets of trusses for this kit.
stock photo
03322 Control Cable: 16 wire 22 AWG shielded control cable, outdoor rated, NON-buriable.  Available in 1 foot increments.  Lengths over 200 feet require the 33v power supply or the remote driver board option.
  03624  OPTIONAL Control Cable, 80m dipole option: 24 wire 22 AWG shielded control cable, outdoor rated, NON-buriable.  Available in 1 foot increments.  Lengths over 200 feet require the 33v power supply or the remote driver board option.  This cable is only used if the 80m dipole option is purchased.
 25 pin dsub  03650 DB25 dsub Field Splice: The db25 field splice is used to connect the control cable to the SDA 100 electronic controller. The field splice consists of 3 terminal headers that are mounted to a PCB board, which is in turn connected to a male DB25 connector.  The control cable is connected to the splice using the included wiring diagram.  Having the field splice allows for exact lengths of control cable, with lengths available to the nearest foot.  In addition, if the cable is being run into a conduit, it eliminates the need to cut off the connector.
 16 wire Voltage Suppressor  06116 OPTIONAL Voltage Suppressor: Line filter (16 conductor) for filtering ESD and other unwanted voltages from the Control cable. Made by Array Solutions.  A better option would be the 09130 Advanced Lightning Protection (ALP) module, which internally protects the SDA 100 controller by relaying out the driver chips in case of a lightning strike, near incident event or a dead short.  NOTE:  If the 80m dipole is purchased, you will require 24 conductor control cable.  This also means to protect all wires of your control cable you will need the 06108 8 wire line filter in conjunction with this 16 wire line filter.
33v power supply  01101
33v Power Supply Upgrade: For control cable lengths over 200 feet;  This can be an upgrade on new purchases and a standalone purchase for existing antennas.  For cable runs over 300 feet we recommend the Remote Driver Board (see controller information page).  The remote driver board allows you to run cat5e cable up to 2000 feet away from the tower base (power required at tower for this option)    



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