3 Element Yagi

K7XH 3E Yagi with 40/30 Loop
K7XH tree mounted 3E Yagi with 40/30 loop

The 3 element Yagi is the original Steppir antenna. Using our proven technology it gives continuous frequency coverage from 13.8 to 54 Mhz. There have been many improvements over the years like the addition of a an optional 40/30M rotatable dipole and our now standard electronic controller, the SDA100.  The 3 element Yagi with the 40/30 dipole option is our most popular antenna.  With a 16 foot boom, the antenna models that are programmed into the controller deliver solid gain and exceptional front-to-rear ratios.   Ask any SteppIR owner to “hit the 180” button, and you may be surprised to hear  just how good the front-to-rear really is for this antenna.



3 Element Specs
Specifications 3 Element 20m-6m 3 Element + 40/30m Dipole
Specifications 3 Element 20m-6m 3 Element + 40/30m Dipole
Weight 51lb/23.1kg 58lb/26.3kg
Wind Load 6.1sqft/0.57sq m 8.1sqft/0.76sq m
Longest Element 36ft/10.97m 39ft/10.97m
Turning Radius 9.7ft/6m 19.7ft/6m
Boom Length 16ft/4.87m 16ft/4.87m
Mast Hardware 2.0in/5.08cm 2.0in/5.08cm
Power Rating 3KW 3KW
Wind Rating 100 mph / 160 km/h 100 mph / 160 km/h
Frequency Coverage 13.8 mHz—54 mHz 6.8 mHz—54 mHz
Cable Requirements 12 conductor 22 ga shielded 12 conductor 22 ga shielded
Tuning Rate 1.33 ft/sec – 0.4 m/sec 1.33 ft/sec – 0.4 m/sec
3 Element Performance
Band dBiGain F/R dB
Band dBiGain F/R dB
40m 1.8* N/A
30m 2.1* N/A
20m 7.4 25
17m 8.3 25
15m 8.5 20
12 m 8.5 20
10 m 9.0 11
6 m 6.2(10.1)** 4 (30)**
* with optional 40/30 dipole
** with optional 6m kit




Specification 3E 20m-6m 3E with 30/40m element
 Boom Length  16 ft / 4.87 m 16 ft / 4.87 m
 Boom  1.75 in / 4.45 cm 1.75 in / 4.45 cm
 Longest Element  36 ft / 10.97 m 39 ft / 11.9 m
 Turning Radius  19.7 ft / 6.0 m 19.7 ft / 6.0 m
 Weight  51 Lb / 23.1 kg  58 Lb 26.3 kg
 Mast clamps
 2.0 in / 5.08 cm  2.0 in / 5.08 cm
 Wind Load  6.1 sq ft / 0.57 sq m  8.1 sq ft / 0.76 sq m
 Wind rating 100 MPH (EIA-222-C)  100 MPH (EIA-222-C)
 Adjustable elements  3  3
 Power Rating  3 KW  3 KW
 Feed points  1  1
 Frequency coverage  13.8 – 54 MHz  6.8 – 54 MHz
 Tuning Rate  1.3 ft per second  1.3 ft per second
 Control Cable  12 wire 22 AWG shielded  12 wire 22 AWG shielded


Performance for Ham Bands 3E Gain DBi 3E Front to Rear, DB 30/40 Option gain, DBi 30/40 option Front to Rear, DB
40M n/a n/a 1.8 n/a
30M n/a n/a 2.1 n/a
20M 7.4 25    
17M 8.3 25    
15M 8.5 20    
12M 8.8 15    
10M 9.0 11    
6M  – without passive option 6.2 4    
6M – with opt. passive element
(50.000 – 50.400 MHz)
10.1 30    



Product Features



(click for  detail)
 3E Yagi  00203 3E Yagi 20m-6m:  3E Yagi antenna, 3 x 36 ft elements, 16 ft boom, 51 lb, 13.9Mhz – 54Mhz continuous frequency coverage; Includes basic SDA100 electronic controller
 SDA 100    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  01323  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  01324  OPTIONAL Remote Driver Board for SDA 100 electronic controller:  The remote driver board is mounted near the tower base.  12 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.
 40/30 loop  01410 OPTIONAL 40/30 Loop Element:  The 40/30 loop upgrade option (at purchase) replaces the driven element on the standard 20m-6m Yagi antenna with a loop dipole for 40m and 30m operation.  When the dipole is on these bands, the other elements retract so that there are no interaction issues.  The 40/30m dipole option adds only 7 lb to the weight, 2 sq ft to the wind load and 1.8 ft to the turning radius.  The loop element design makes the overall length for this element 39 feet, 40% shorter than the 70 ft length a full sized dipole would require, with only a 0.4dB drop in gain performance!
 Truss Kit  01601 OPTIONAL Element Truss Kit:  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.
 High wind kit  01201 OPTIONAL High Wind Kit: Replaces standard mast plate with two .25″ mast plates for total of 0.50″; replaces standard U-bolts with high strength aluminum saddles with set screws; 1.75″ for mounting boom to mast plate, 1.75″ – 3″ (your choice, 2″ is standard) available for mounting mast plate to your mast.  Also comes with the EZ-Eye threaded bolt/eye-bolt for added protection against the boom rotating.
 6m Passive  06003 OPTIONAL 6m Passive Element Kit: The standard antenna has 6m capability but the spacing is not optimal, so performance akin to a high gain dipole – 5.0 dBi gain but only 2dB front-to-rear.  Adding the 6m passive element kit gives you 3 nicely spaced elements with gain of 10.1dBi and front-to-rear of 30dB.  Because this is a fixed element, the performance effect is only good from 50.0MHz to 50.400MHz.  A must for anyone using 6m!
  03222 Control Cable: 12 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 (see SDA 100 controller page).
 25 pin dsub  03650 OPTIONAL 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.
 Voltage Suppressor  06112 OPTIONAL Voltage Suppressor: Line filter (12 conductor) for filtering ESD and other unwanted voltages from the Control cable. Made by Array Solutions.  A better option would be the 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 (see controller section for more information)
   01501 OPTIONAL Connector Junction Box: Replaces the standard cylindrical plastic housing; The standard antenna comes with a cylindrical plastic housing (affectionately referred to by many as the “pipe bomb”, due to its looks) with plastic caps on each end.  The control cable wires are connected to terminal strips, which are then placed into the plastic housing.  The connector junction box is a hinged enclosure that has female terminal headers mounted inside.  The control cable and EHU cables are then connected to a male terminal plug, creating a pluggable/unpluggable connection for the antenna wiring.  The connector junction box also includes a 25 pin female dsub mounted inside, for testing the antenna at the point of installation.  Highly recommended!
 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)
40/30 loop


 00710 OPTIONAL 40/30 Dipole Retrofit: This option is available for antenna owners that already have purchased a 20m-6m Yagi but would like to replace the 20m driven element with the 40/30 loop.  The cost is more than it would be to upgrade at time of purchase because it is an entirely new element replacing the existing 20m driven.  Many people convert their left over 20m driven into a dipole or keep the EHU as a spare.

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