Hi Thierry.

A simple way to do this is to use a coax as ts the sleeve.

Just cut the coax to a 1/4-wave, connect a 1/4 wire to the inner=20
conductor at one end of this coax, and feed the other end of the coax=20
through a choke balun, and there you have it: A simple inexpensive=20
coax-sleeve antenna.


73 de Hans, SM3PXG
=D6stersund
Sweden



hello wrote:
=20
HI
I want to put a dipole for 20m in my garden.
A tree and the home roof will be ok to fix the extremity.
My problem is the feed point : If IA center feed it , the feed line wil=
l=20
just hang at the center of the garden, something not acceptable by the =

YL :-)
=20
So I'm looking for a way to feed it by one "side".
I could endfeed it, but impedance matching is not so easy at such a hig=
h=20
impedance.
Then, after reading lots of post in this newsgroup, I read about the=20
sleeve antenna : generaly a vertical dipole where one leg is a sleeve.
Coax enter in the sleeve to the center feed point.
I think this antenna could work horizontaly and for HF and solve my=20
problem. Now, hanging horizontaly a 5m long metallic sleeve is surely=20
not a good idea, but at HF , I thing that man could replace the sleeve
by some wire cage.
So I end up with the idea of a cage or biconic dipole , with the coax=20
entering horizontaly in the middle of the cage to the center.
=20
What do you think of this idea ?
How many wire for the cage 2 (a bowtie), 3, more ?
Do you have a better one for my particular constrains ?
=20
Lots of questions, but I'm sure you will have lots of answers !
=20
Thanks in advance
=20
Thierry
F4DWV