On 8/31/2016 10:10 AM, Ralph Mowery wrote:

I have seen many plots of inverted V and flat top dipoles, but none of a
V or U shaped one.

That is like one I have up for 80 meters. I have two trees that are
about 20 feet short of the distance I need for an 80 meter dipole. The
trees are so that I can get the wire up about 60 to 70 feet on the ends
and the middle is only about 35 to 40 feet above ground. As I don't
plan on digging up and moving the tree, I just have to take what I can
get for that antenna. I know it would be nice to have the middle up
higher as that is where most of the radiation is suspose to come from.

Are there any web sites that may have one of those types of antennas
already ploted ?

Yeah. Search for V antenna on the Web. A V antenna has some gain
pointing approximately away from the apex. Your description indicates
that you might warm the clouds. Jimp's suggestion is a good one.

In article , says...


Yeah. Search for V antenna on the Web. A V antenna has some gain
pointing approximately away from the apex. Your description indicates
that you might warm the clouds. Jimp's suggestion is a good one.

I know about th emodling programs and have played with a few that
already have the elements in them. Just have not seen one for the U
shaped one like I have. I am not too familiar on how to enter elements
that are not streight. Come to think of it, I guess I could enter it
just as a V shape like the inverted V antennas are.

The V antennas that have gain I am thinking of are usully horizontal
and several wavelengths long.




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Ralph Mowery wrote:
In article , says...


Yeah. Search for V antenna on the Web. A V antenna has some gain
pointing approximately away from the apex. Your description indicates
that you might warm the clouds. Jimp's suggestion is a good one.

I know about th emodling programs and have played with a few that
already have the elements in them. Just have not seen one for the U
shaped one like I have. I am not too familiar on how to enter elements
that are not streight. Come to think of it, I guess I could enter it
just as a V shape like the inverted V antennas are.

The V antennas that have gain I am thinking of are usully horizontal
and several wavelengths long.




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A dipole with no support in the middle and the weight of the cable will
be close enough to straight for all practicle purpose.

If you support in the middle, the wire on each side will take the shape
of a Catenary. See: https://en.wikipedia.org/wiki/Catenary

You can, from the above, plot what the shape will be and approximate
with two or three straight lines for either side.


--
Jim Pennino

On 8/31/2016 1:46 PM, Ralph Mowery wrote:
In article , says...


Yeah. Search for V antenna on the Web. A V antenna has some gain
pointing approximately away from the apex. Your description indicates
that you might warm the clouds. Jimp's suggestion is a good one.

I know about th emodling programs and have played with a few that
already have the elements in them. Just have not seen one for the U
shaped one like I have. I am not too familiar on how to enter elements
that are not streight. Come to think of it, I guess I could enter it
just as a V shape like the inverted V antennas are.

The V antennas that have gain I am thinking of are usully horizontal
and several wavelengths long.

What jimp said plus EZNEC can model a catenary. I've not used it, but
it's there.