A jpole is a end-fed halfwave - and because of that, lends itself well to
vertical applications.
It could just as well be oriented horizontally,
but
for a half-wave horizontal antenna,
a run-of-the-mill center fed dipole may be in order.
feed it directly with coax from the transmitter.
or not
(long runs may deserve twin lead or ladder line)

"Chuck W." wrote in message
ups.com...
http://www.tfn.net/~gfloyd7/antenna

I'm interested in a wire gain antenna for 6m SSB, and the design above
looks like a pretty quick project. Is it possible to use a j-pole like
this above efficiently as a horizontal antenna? Couldn't it be
center-fed with, say, 2 collinear half-wave sections seperated by 1/4
phasing stubs? In doing so, I was thinking of feeding the center with
300 ohm balanced line.

Thanks for any thoughts.

-Chuck
W1CEW
www.chuckwyatt.com

Won't the vertical collinear still win over the dipole because of gain,
on the order of 3-6 dbd?

Now somewhere I've seen a center-fed horizontal antenna. something like
a double Zepp, but in addition to feeding the two halfwaves on each
side, there is additional halfwave sections added to each end via 1/4
wave phasing harnesses, or maybe I'm just imagining something from an
old antenna handbook.


-Chuck

Chuck W. wrote:


Now somewhere I've seen a center-fed horizontal antenna. something like
a double Zepp, but in addition to feeding the two halfwaves on each
side, there is additional halfwave sections added to each end via 1/4
wave phasing harnesses, or maybe I'm just imagining something from an
old antenna handbook.


-Chuck



You have described a horizontal colinear antenna. It has gain broadside
to the wire but don't expect good results off of the main lobes.
Of course if you have a preferred direction, or work two locations 180
degrees apart it works nicely.

OOH!
If you want a 'gain' antenna - the easiest to do is a 5/8-wave for a
vertical, and you just add enough of a coil at the bottom to get your match
to 50 ohms. its hard to beat as far as verticals go..
and for a good gain horizontal antenna:
a double zepp - a dipole with both sides 5/8-wave - a total of 10/8 wave
( one and a quarter wave )
- but its fun to experiment with co-phased antennas -
I say - get a MFJ 259 and have fun playing.
I like quads and quagis.
but for vhf and uhf: the best improvement is height. - get that antenna up
high.


"Chuck W." wrote in message
ups.com...
Won't the vertical collinear still win over the dipole because of gain,
on the order of 3-6 dbd?

Now somewhere I've seen a center-fed horizontal antenna. something like
a double Zepp, but in addition to feeding the two halfwaves on each
side, there is additional halfwave sections added to each end via 1/4
wave phasing harnesses, or maybe I'm just imagining something from an
old antenna handbook.


-Chuck