[TowerTalk] Antenna Modeling Question Update

[KD4OL@aol.com]

I want to thank those of you who responded to my question.  Several 
recommended W7EL's EZNEC V3.0 program.  

I looked at his demonstration program but was unable to use it properly to 
fit my needs.  I probably lack some software navigational ability.  
Suggestions?

I intend to put up a 100 - 120 foot tower with either two or three 10 meter 
yagis.    I have three Telrex 10 meter yagis in which I could use in a 
stacked configuration vertically.  Two of them are 5 elements each on 23 foot 
booms and one has 10 elements on a 45 foot boom.  

I would like to get the best configuration for not only dx but for long 
distance ground wave.  I thought that by mounting the longer boom yagi at the 
top, with the smaller ones lower, that would be the best overall.  However, I 
would like to be able to see what the experts think is best with this.  

Also, I have a nice 6 element 20 meter Telrex that I would like to see if it 
is possible to mount it at the top of the tower with the long boom 10 meter 
yagi about 8 feet or so above it.  This would complicate matters, I suppose 
but i am interested to see if it is possible for the tower to handle this.  

I intend to use either a Rohn 45 or maybe 55 type tower, fully guyed.  I 
would probably have to use heavier and stronger guys at the top section than 
recommended by Rohn.   Don' t know how much to heavy-up.

I realize that I would need a matching system, perhaps from WX0B for the 10 
meter system.  Of course the 20 meter antenna would have its own separate 
coax.

Since I want to get it right the first time, and not do alot of "maintenance" 
or systems alternations later, I would appreciate the collective wisdom from 
this fine group such as you all.  What do you suggest?  

Hank
KD4OL


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