Going by water table: In the spring and after prolonged wet spells our
water table is just a few inches below the surface except around the
house where the weep tile get a good workout as does the sump pump.<:-)
In mid summer the water table is "usually" about 5 feet down. When I dug
the hole for the base of the 45G, at 5 feet there was just a little
water that collected in low spots.
So, I think the radiation angle , or signal strength out to a few
hundred miles would change quite a bit although the soil to the N and W
quickly becomes peat with a rather low PH.
Within a few feet of our yard there may be as much as a foot of standing
water except in summer with a few notable exceptions.
The 75 and 40 meter, center fed, half wave, sloping dipoles with the
tops around 90 to 95 feet seem to work well off the sides for most of
the US, but really haul off the ends for DX and the W coast.
True, I run the legal limit but can normally work anything I can hear.
In my case, I put up what was handy, easy, and fit in the allotted area,
regardless of modeling and others experience and was pleasantly
surprised. Yes they are a compromise and certainly do not come near the
big installations, but OTOH I seem to get into DX over most stations on
both the Right and left coasts.
73
Roger (K8RI)
On 10/12/2015 12:15 PM, Stephen Davis wrote:
I was indicating what my actual results are, regardless of what software
indicates. Also, if I had looked at software first, I might still have done
the NIVIS based on other practical experience noted by others in the research I
did. Lastly, without software or others' experience, I still would have tried
because my high water table (in the ground) is 2 - 2.5 ft below grade for a
few months in late winter to spring, and otherwise right about 5.5 ft below
grade (tested when required by town for building an addition, we are on wells
and septics thus the requirement.) I only wish I had a way to add salt to the
water HI.
Hey, it works well for me, maybe not well for others and I don't disagree with
Jim's assessment of the software results. And again, it is so easy to erect
that maybe worth a try where you are.
Steve K1PEK
<snip>
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