3 element 21MHz OP-DES Yagi (2.7m)

Manufacturer InnovAntennas

A Wideband 21MHz OP-DES Yagi
Sales price £379.95
gross price
Sales price without tax £316.63
Sales price without tax£316.63
Tax amount £63.33
Total Tax: £63.33


altA 3 element wideband 21MHz OP-DES (Opposing Phase Driven Element System) Yagi

The OP-DES is the newest in patent technology produced by InnovAntennas and is specifically designed for maximum performance, wide-band HF applications. Read more about the OP-DES Yagi Here. InnovAntennas use the latest in Electromagnetic Design Technology to ensure the very best results and the OP-DES Yagi is proof of that!

This antenna has a flat SWR curve covering 21.000 - 21.450MHz at 1.1:1 SWR.


Gain: 7.44dBi @ 21.250MHz

F/B: 13.5dB @ 21.250MHz

Peak Gain: 7.51dBi

Gain at 15m above Ground: 12.83dBi

Peak F/B: 14.3dB

Power Rating: 5kw

SWR: Below 1.1:1 from 21.000MHz to 21.450MHz

Boom Length: 2.696m

Weight: 5.69Kg / 12.53LB

Turning Radius: 3.824m / 12.5ft

Wind Loading: 0.32 Square Metres / 3.49 Square feet

Wind Survival: 179KPH / 111MPH - (125MPH Version available upon request)

Other options available if higher wind loading/survival is required.

Stacking Distance: 5 - 9m ( 8m recommended)

2 Stacked Gain @ 8m spacing: 10.49dBi

2 Stacked F/B: 12.18dB

2 Stacked Gain @ 8m Spacing 15m above ground: 15.55dBi


This antenna is made with 3/4 inch (19.05mm) element sections in the centre of each element, followed by 5/8 inch (15.88mm) and 1/2 inch (12.7mm) outer elements with the OP-DES end sections 3/8 inch (9.525mm). The antenna has fully insulated elements which will ensure continuous, high performance for many years to come. Boom to mast brackets are included with all antennas which will support 2 inch (50mm) masts.  Boom is 1.5 inch square 16SWG aluminum.


Our antennas are constructed with the best quality materials in order that the best mechanical construction can be achieved, not the cheapest and most profitable! Even a digital caliper is used (with an accuracy of .01mm) to measure the elements during production to ensure they are within 0.2mm of what they should be, this ensures they work as well as our software model predicts.

Note: much development time has gone into our antennas, not just on basic electromagnetic design, we are able to model the effect of insulators, booms and other objects to ensure the make up of our antennas have least effect on performance and pattern degradation. More information can be found here

  • Marine grade Stainless Steel Fittings*
  • Original Stauff Insulation clamps
  • Mill finished boom and elements for highest levels of accuracy


Azimuth Plot


Elevation Plot


Single 3 element OP-DES up 15m above ground


2 x 3el OP-DES Yagi 8m apart with the bottom antenna 15m above ground


The 3el 21MHz OP-DES Element Layout - how the OP-DES Yagi looks



Manufactured the right way, not the cheapest way! 

* Where possible marine grade stainless steel components are used

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