[TowerTalk] Rohn 25 for 80m vertical?

[Tom Haavisto]

Hi Marty

I just built a tower out of Radio Shack TV tower - 8 inch face.  I used 50
feet of tower with a 15 foot piece of aluminum tubing out the top, and it is
a bit on the short side - I figure another foot would be better.  Base is
insulated, and I am using Phillystran guys.

Being a "large diameter" makes it more broadbanded - it covers the whole
band with under 2:1 SWR.  It only has around 30 radials right now - it is
the first part of my four square, and it works great :-)

Tom - VE3CX





On Tue, Dec 22, 2009 at 7:53 PM, <brahmangou at aol.com> wrote:

> Hello all,
>
> I'm wanting to put up a full sized 80 meter vertical made from Rohn 25 in
> my pasture. I have a teflon insulated tilt base for the tower to isolate it
> from  ground and phillystrand to guy it with. When I ran it through eznec
> it
> shows the  antenna needs to be only about 38' tall. I know I must be making
> a mistake  somewhere. I can find plenty of articles about shunt feeding a
> grounded tower,  but nothing about making a vertical from a tower. Has
> anyone
> on the list done  this before? Possibly there is a reason that this will
> not work, or someone  would have already written about it. Any help?
>
> Marty Haley AB5GU
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