[Antennas] Fat rugged dipole?

Wed Jul 27 12:44:54 EDT 2016

Kurt,
You're not going to change the rules of physics, one half wave is always
going to be the same size.
you could make the antenna in the form of a loop, but you'll need a full
wave, or about three feet, but that's about nine inches on a side.
You could load the antenna with coils our top loading but depending what
you do the efficiency could be much reduced.
Would you tell us what type of application this is in? Is it receive
only?
Best wishes,
David N1EA
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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