On Tue, 19 Jul 2011 15:21:09 -0700 (PDT), Jay Scherberth
wrote:

Purchase price up to $400.00 OK. Any ideas of what might work in my
situation?

Hi Jay,

Google for "Sleeve Dipole" (a vertical) which consists of staged
tubing, the upper element insulated from the lower. Do not connect
the lower element to ground. Thread the driveline coax up inside the
lower element and connect the shield to the top inside of the lower
element. Connect the coax inner lead to the bottom of the upper
element.

As I said, google for images as this description may frustrate you.

Invest the rest of your money (after buying sufficient quantity of
tubing) in your tuner. You may still have a lot left over.

73's
Richard Clark, KB7QHC

Richard, isn't this pretty well what the GAP antenna does ??

Jim K4PYT

-------------------

Hi Jay,

Google for "Sleeve Dipole" (a vertical) which consists of staged
tubing, the upper element insulated from the lower. Do not connect
the lower element to ground. Thread the driveline coax up inside the
lower element and connect the shield to the top inside of the lower
element. Connect the coax inner lead to the bottom of the upper
element.

As I said, google for images as this description may frustrate you.

Invest the rest of your money (after buying sufficient quantity of
tubing) in your tuner. You may still have a lot left over.

73's
Richard Clark, KB7QHC

On Tue, 19 Jul 2011 22:12:17 -0400, "James"
wrote:

Richard, isn't this pretty well what the GAP antenna does ??

Hi James,

Yes, in large degree given my experience with the Gap Eagle. I figure
it would draw more than the usual attention, and become a target for
the covenants, deeds, and restrictions.

73's
Richard Clark, KB7QHC

"Richard Clark" wrote in message

Google for "Sleeve Dipole" (a vertical) which consists of staged
tubing, the upper element insulated from the lower. Do not connect
the lower element to ground. Thread the driveline coax up inside the
lower element and connect the shield to the top inside of the lower
element. Connect the coax inner lead to the bottom of the upper
element.

As I said, google for images as this description may frustrate you.

Invest the rest of your money (after buying sufficient quantity of
tubing) in your tuner. You may still have a lot left over.

73's
Richard Clark, KB7QHC

One of these for 10m was the first HF antenna I ever built. I wish I had
known then about decoupling the feed line, as I never could get repeatable
VSWR data, possibly due to common mode current. Maybe I'll rebuild it and
try again with a suitable choke.

I read about the sleeve dipole before I built it and I will pass on a
caution: The end where the cable comes out is a high voltage point
(expected for the ends of dipoles); higher powers may punch through the coax
outer jacket to the coax shield. I use a piece of PVC plumbing pipe as
additional separation inside the lower element and never had an issue.

"Sal"

Happy building.

On Jul 19, 3:55*pm, Richard Clark wrote:
On Tue, 19 Jul 2011 15:21:09 -0700 (PDT), Jay Scherberth

wrote:
Purchase price up to $400.00 OK. Any ideas of what might work in my
situation?

Hi Jay,

Google for "Sleeve Dipole" (a vertical) which consists of staged
tubing, the upper element insulated from the lower. *Do not connect
the lower element to ground. *Thread the driveline coax up inside the
lower element and connect the shield to the top inside of the lower
element. *Connect the coax inner lead to the bottom of the upper
element.

As I said, google for images as this description may frustrate you.

Invest the rest of your money (after buying sufficient quantity of
tubing) in your tuner. *You may still have a lot left over.

73's
Richard Clark, KB7QHC

Richard - Is there such a thing as a multi-band HF sleeve dipole or is
this more of a VHF/UHF solution?

On Tue, 19 Jul 2011 20:28:54 -0700 (PDT), Jay Scherberth
wrote:

Richard - Is there such a thing as a multi-band HF sleeve dipole or is
this more of a VHF/UHF solution?

Hi Jay,

It is multiband if your tuner can pull the SWR into reasonable limits.
However, you do NOT want the overall length of the antenna to exceed
roughly a 1.25 wavelengths of the highest frequency you intend to
multiband. This is for two reasons at that frequency:
1. Difficult to tune at 1 wavelength;
2. Radiation is directed up at a high angle if longer than 1.25 wl.

Please read Sal's perceptive comments about hi voltage exposure; and
observe his statement about choking the line.

Futher, and this complicates the simple rules above, your sleeve
dipole does not need to be made of equal length elements. This raises
the prospects of another topic:
Vertical, Off Center Fed Dipoles.

As for building ground radials - skip that wasted effort. You have
too little footprint available, and your ground isn't conductive
enough to present that much loss. This is why I suggested the sleeve
dipole.

73's
Richard Clark, KB7QHC

"Richard Clark" wrote in message
...

snip

... your sleeve
dipole does not need to be made of equal length elements. This raises
the prospects of another topic:
Vertical, Off Center Fed Dipoles.

Yes.

Mine was mounted with the end of the bottom element within reach from the
ground. I lengthened just the bottom element experimentally with a simple
clip lead -- and that worked. Sometime "cheesy" works. :-)

"Sal"