Take a look at the attached pdf it works quite well and I have a 40 meter
Delta loop fed with ladder line for multi band use that works great also.
73's Steve KE4THX
On Wed, Nov 12, 2008 at 2:26 AM, Marinus Loewensteijn <zl2ml@hotmail.com>wrote:
>
> Situation is: small lot, not enough room to put up full size 40 mater
> dipole, shortened just OK. Some trees (neighbours, cannot do much about
> them) Property is sloping (long path to open sea), two story "town house
> (two houses under one roof).
>
> Presently experimenting with a 40 meter rotatable dipole and not happy. A
> lot of local interference and not enough DX.
>
> Did a lot of exploring on the internet but cannot seem to come up with
> something that is going to look like a "garanteed winner".
>
> Have thought about half wave L antenna, centre fed at the top. Cannot make
> the top leg much longer than approx 11.5 meters but to the ground more is
> possible. However am concerned about the noise level.
>
> Am now considering: A "sloping delta loop, the top leg horizontal, one leg
> diagonal and one leg "vertical" (90 degree angle with the top horizontal leg
> - but still sloping ). Will be feeding it in the top corner where the 90
> degree corner is. Slope will be towards sea and bottom is expected to be
> around 7 foot from the ground.
> Main reason to consider a loop is that a loop is considered to be
> performing reasonably well in close proximity to surrounding trees and is
> supposed to give a few S points less noise.
>
> MMANA gives a favourable pattern but I know MMANA is not too accurate when
> modelling close to the ground.
>
> The more knowledgable antenna experts under the group (at least more than
> me): what do you reckon: a good idea or should I go for something else?
>
> Thanks in advance
> marinus, ZL2ML
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