[Antennas] Fat rugged dipole?

[frank]

On Wed, 27 Jul 2016 12:44:54 -0400
"D.J.J. Ring, Jr." <n1ea at arrl.net> wrote:

> Kurt,
> 
> You're not going to change the rules of physics, one half wave is always
> going to be the same size.

Well, my physics book says that very fat dipole elements are shorter than very thin dipole elements to be resonant at the same frequency.  How much shorter depends on how fat is fat.  I am pretty sure you will not get more than a 10% length reduction no matter how fat the element gets.

The same holds true for verticals.  Maybe you can go up instead of out?



> On Jul 27, 2016 12:16 AM, "KD7JYK DM09" <kd7jyk at earthlink.net> wrote:
> 
> > I've been running some number for a dipole at 312 MHz.
> >
> > Using 468/f, I get 1.5', too large for my installation and that's for a
> > "wire" antenna.
> >
> > I need something rugged to avoid possible damage grom vandals, and most
> > likely, large animals.  No problem with a couple of elements turned out of
> > solid aluminum looking like a couple of small soup cans...
> >
> > I know a radial can be shortened to an extent if it's fattened...
> >
> > Generally, for an element of 4" or 6" length, how fat would it need to be
> > to
> > be resonant at 312 MHz?
> >
> > Is there a resaonably easy to use calculation for such things?
> >
> > Thanks.
> >
> > Kurt
> >
> >
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-- 
73,  Frank