[TowerTalk] 75 meter antenna

[David Jordan]

Yes, I've not run the measurements myself...a friend provided theidb 
inputs...in my current configuration there are
reflectors on the ground that are cut 5% long.  I doubt they will add 
much but you might try adding them to your EZNEC.

4 or 7db it does the trick...

73,
dave
wa3gin

Al Williams wrote:

>EZNEC shows that this configuration is a barn burner for straight up 
>propagation providing about 4 db gain over a single dipole and much 
>attenuation at lower elevation angles.  However EZNEC shows that raising the 
>antennas from 15' to 20/25 adds about 1 db of gain.  NVIS articles and 1 
>book that I have read say
>that the optimum height is about .2 lambda which agrees with my EZNEC 
>modeling. Raising the antennas also makes the input impedance a bit more 
>manageable.
>EZNEC doesn't seem to agree with the "...theoretical gain of about 7db"  as 
>it reports about 10 dbi?
>
>It would seem that this configuration would be especially helpful in areas 
>with high ham populations--not so good in Wyoming, etc.
>
>k7puc
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