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OK so to model typical installs here in Blighty make the antenna with the antenna feedpoint at 21ft. It will be fixed at this for all lengths.

So we have the first mast which is the 21ft scaffolding pole, this will be in contact with the earth. 2" diameter.

Next we have a 16.4ft pole which is another common length so the top of that will be at 21ft, the base 4.6ft above the ground. 1.5" diameter pole.

Another common length is 10ft pole, again 1.5" diameter, the top of it at 21ft, the base 11ft above the ground.

Hope that makes things a little clearer.

[QUOTE="M0GVZ, post: 734061, member: 22312"] OK so to model typical installs here in Blighty make the antenna with the antenna feedpoint at 21ft. It will be fixed at this for all lengths. So we have the first mast which is the 21ft scaffolding pole, this will be in contact with the earth. 2" diameter. Next we have a 16.4ft pole which is another common length so the top of that will be at 21ft, the base 4.6ft above the ground. 1.5" diameter pole. Another common length is 10ft pole, again 1.5" diameter, the top of it at 21ft, the base 11ft above the ground. Hope that makes things a little clearer. [/QUOTE]

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