M3 wrote:

K1SWR wrote:
How about the isotron antenna. take a look at:
www.rayfield.net/isotron

Sounds ideal, any one used/using one do they really work. I'm only looking
to work local not really bothered with DX as such.

Save your money. An Isotron for 160m is simply a very bad idea.
The best idea so far is a vertical, as tall as you can make it,
with a radial system as extensive as you can make it, with a
top hat as big as you can make it, matched at the base of the
antenna.
--
73, Cecil http://www.qsl.net/w5dxp




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Hi Brian

There are two legs, only one is shown as the other is identical to it.

The closer you bring the ends the more directional the antenna
becomes. I had my legs 80 feet apart on one system and only 25 feet
apart on another system, both worked equally well, except the one with
the smaller spread was considerably more directional.

In my response I had asked if the poster could eke out another 6 to 8
feet, making that 17 feet dimension possibly 23 to 25 feet wide.
Because at under 20 feet of spread, it begins to loose some
functionality and noise levels increase exponentially. At least where
mine was installed that is.

I had tried all kinds of antennas for 160 in my small backyard and
this one worked the best for me in my situation. Many others have
used it, most with great success, but in some locations it worked
worse than other designs they were using.

When I moved the legs from the northern facing backyard to the
southern facing front yard, the antenna did not work very well at all.
Probably because of the many obstructions around it when situated in
that direction.

It's cheap, easy to assemble and try, if it doesn't work, you still
have your two 130 feet sections of wire to try something else.

TTUL
Gary

On Sun, 18 Apr 2004 15:45:13 +0100, "M3" *** wrote:

K1SWR wrote:
How about the isotron antenna. take a look at:
www.rayfield.net/isotron

Sounds ideal, any one used/using one do they really work. I'm only looking
to work local not really bothered with DX as such.

Cheers all for your replies so far.

I used an isotron 160 antenna for a short time. Working local stations
it worked great but I was never able to work any DX.

Gary V. Deutschmann, Sr. wrote:
I had my legs 80 feet apart ...

Ouch!



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Edward Lewis wrote:
I used an isotron 160 antenna for a short time. Working local stations
it worked great but I was never able to work any DX.

I'll bet most of your radiation was from your feedline.
--
73, Cecil http://www.qsl.net/w5dxp



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I'll bet most of your radiation was from your feedline.
--
73, Cecil

But it worked, didn't it!

On Sun, 18 Apr 2004 17:54:39 +0000 (UTC), "Reg Edwards"
wrote:

I'll bet most of your radiation was from your feedline.
--
73, Cecil

But it worked, didn't it!

Why doesn't someone write a book on radiating feedlines? They'd be a
heck of a lot easier to put up than antennas :-)

Bob
k5qwg

Reg Edwards wrote:

I'll bet most of your radiation was from your feedline.

But it worked, didn't it!

Pity the poor ham who puts an Isotron on a ten foot pole
for field day.
--
73, Cecil http://www.qsl.net/w5dxp



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Bob Miller wrote:
Why doesn't someone write a book on radiating feedlines? They'd be a
heck of a lot easier to put up than antennas :-)

A 1/2WL dipole is an open-circuit radiating feedline
complete with reflections. :-) From Balanis: "The current
and voltage distributions on open-ended wire antennas are
similar to the standing wave patterns on open-ended
transmission lines." Wasn't the original Gap antenna
simply a leaky transmission line?
--
73, Cecil http://www.qsl.net/w5dxp



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"Dave VanHorn" wrote in message
...

"AM200" wrote in message
...
OMG your garden is TINY. You will never be able to operate on top band
unless you get a vertical!
I wish mine was 40*17ft.

A loop?

A loop should be cut at approx. lambda/10, so with a circumference of 16m or
a radius of 5m !
Too bulky for a small garden

Thierry, ON4SKY
http://www.astrosurf.com/lombry