20-15m 2/2 Element Delta Loop (Heavy Duty)

20-15m 2/2 Element Delta Loop (Heavy Duty)

A 2/2 Element Dual-Band Delta Loop Antenna for 20 and 15m


Product Code – 20M2-15M2WWHEAVY

A 2/2 element Dual-Band Delta Loop for the 15 and 20m band from our ‘Heavy Duty’ range. Manufactured from lightweight but extremely strong construction grade 6082-T6 Aluminium stock with a heavy duty boom. This dual-band antenna features 5 sections of 6082-T6 or *AA6082-T6 tubing on the 20m vertical sections and 4 on the 15m section. The antenna includes 6.35mm Diameter Wide Multiplate Element Brackets for the 15m elements and 10mm A2 304 Stainless Steel brackets for the heavier 20m elements. We include H/Duty Polyamide Element Clamps with M10 Stainless Hardware. Antenna is supplied with all hardware except boom to mast mount (see below). The antenna has 2 full size loops on both bands.

Both 20 and 15m element mounting plates include a horizontal M8 stainless steel bar which eliminates the sideways movement of the plates in windy conditions (Not shown on test antenna). Vortex has also now introduced a new top wire for Delta Loop antennas for the 15m and lower bands. Our new top wire is manufactured of stainless steel with a silver coating which makes soldering easy. It is also very very strong and is extremely resistant to stretching. The top wire is now also attached to the vertical element legs by using a method to remove tension directly off the top wire. A ‘Thimble’, ‘Mikalor ‘P’ Clip’ and a ‘Duplex Clip’ (All manufactured from 316 Marine Grade Stainless Steel) acts as the main area of tension on the wire. This removes nearly all the strain where the wire is connected to the top element leg. The revised wire material and lengths has also required additional testing for gain and front to back. As you can see from the evaluation images, this antenna was tested and fully built using the exact same components and measurements, so you can be sure your own antenna will work as expected. See the photos below for more info.

Experience has shown us that the 2 element Delta Loop is very friendly electrically. The two element design has a very wide bandwidth and this dual bander is no exception.
During evaluation and testing the 2 to 1 SWR limits on the 15m loop was between 20.420MHz and 22.700MHz.
The WHOLE of the 15m band had an SWR of BELOW 1.1 to 1.
That’s pretty impressive! The icing on the cake was that we had similar results with the 20m loops. During testing the 2 to 1 SWR limits were between 13.600 MHz and 16.114MHz.
The WHOLE of the 20m band had an SWR of 1.1 to 1 or less.

All VORTEX Antennas can be shipped WITHOUT any boom to mast mounting plates. Select this option from the dropdown menu when purchasing. Other options include the choice of mounting plates and complete mounting solutions with U-Bolts and Brackets.

See info below for mechanical and electrical details

  20-15m 2/2 Element Delta Loop (Heavy Duty)

Band(s):  20m (14Mhz) and 15m (21Mhz)
Element Material:  6082-T6/*AA6082-T6
Element Brackets (20m): 304 A2 Stainless Steel 10mm Heavy Duty Element Brackets (x2)
Element Brackets (15m): 6082-T6 aluminium plates with stainless support bar (x2)
Boom Material:  6082-T6 box section aluminium
Boom Length:  4.0m
Gain:   7.32dbi (20m) and 7.54dbi (15m)
Front to Back Ratio:   Better than 20db on both bands
Feed:   Coax via SO239 sockets x2
Matching:   Vortex Gamma Match x2 (PTFE dialectric)
Rating:   3.5kw
Active Elements:   2 on each band
Element Clamps:   Stauff (Germany) – heavy duty polyamide series
Loop Top Wire:   2mm copper clad steel
Antenna Weight:   38kg
Optional High Wind Element Support Kit: More info here
Hardware:   304/316 stainless steel

*If available