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Have a look at Bobans website YU7XL , lots of information on his antenna designs,the photo's above are the QY20910XL4. The antenna is at a modest height of 8mtr's and has been in use for several months with excellent results.
Listed below is an example from his website of the information and details he provides for his antenna designs.
ANTENNA QY20910XL4D2
Good stacking characteristics at moderate both vertical and horizontal distances
* ΔF given for SWR=1.5
Building hints: No boom correction included.
A close up of the antenna at ground level,I have made the element spacers from kitchen chopping board. This method for element mounting has been used on all my antennas, a bit more work but a better job. A 12volt car screw jack can be seen and the idea is to use it for elevating antennas.
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