"'Doc" wrote in message ...
Is there any way you could
attach a wire doublet of some length to the eaves or peak of
your roof? Doesn't necessarily have to be of any particular
lengths or symetrical shape Longer is better), although that
would peobably help. Any height is better than no height,
as you'll be finding out...

Hello Doc,

I am on the ground floor of a two level apartment building. No roof to get
at and no eaves. My unit itself has 3 floors counting the basement where
the shack is. I was running a vertical, about 25' hung from under the
balcony above me, totally invisible, except being so close to the building
itself, the noise levels on 40 and 20 made those bands useless. Also being
vertically polarized, it was causing RFI on the computer upstairs, and
probably the neighbours as well. I have no way of running anything
horizontal above the ground as this would involve climbing and hard to do
that without the neighbours noticing. I have a feeling the property managers
will be doing some work on the balconies in the spring anyway, so the
antenna would surely be noticed then. I think I am going to go for the
ground laid antenna and hope for the best. My other alternative is a 8' CB
whip with a flag on the top, which has been up before without any problems.
This antenna is however too short to load on 40 with the tuner.

Thanks for all the input guys, I will scratch my head some more, maybe I
will think of some way to hang something from the balcony.

Paul, AB0SI wrote:
"hmmm, this stuff I have read on NVIS says 0.1 to 0.2 wavelengths."

Yes, and I said 0,25 and explained how I arrived at that figure. So, I
went to page 3-11 of the 19th edition of the ARRL Antenna Book to look
at Fig 12.

Fig 12(A) is for 1/8-WL high and Fig 12(B) is for 1/4-WL high. Paul is
supported by Fig 12 because the 1/8-WL high antenna appears to have more
radiation toward the zenith than does the 1/4-WL high antenna.

I don`t know why, but would speculate it is due to closer coupling of
the radiator with the earth which gives the reflector (earth) more
energy to work with on the reflection. Maybe I`ll learn something from
this bum steer. I learn something nearly every day here and find this a
rewarding experience.

Best regards, Richard Harrison, KB5WZI

Max,
If nothing else presents it's self, you might try a
'CCD' (Controled Capacitance Distribution antenna). The
biggest draw backs are that they are a wave length long
and use silver mica capacitors that are not cheap. But
it can be laid on the ground and they do work. There's
a pretty good writeup in one of the ARRL's Antenna
Compendium books, not sure which one. It wouldn't be my
first choice in your situation, but it is an alternative.
'Doc

Richard:

Interesting, thanks. This is one of the few places it seems where folks can
have a reasonable conversation without it quickly turning into a
name-calling contest. You idea of why a lower elevation works a bit better
sounds reasonable. I just remember the empirical fact. Sort of like a 5-year
old's reason for do anything --- b'cause!

Paul AB0SI


"Richard Harrison" wrote in message
...
Paul, AB0SI wrote:
"hmmm, this stuff I have read on NVIS says 0.1 to 0.2 wavelengths."

Yes, and I said 0,25 and explained how I arrived at that figure. So, I
went to page 3-11 of the 19th edition of the ARRL Antenna Book to look
at Fig 12.

Fig 12(A) is for 1/8-WL high and Fig 12(B) is for 1/4-WL high. Paul is
supported by Fig 12 because the 1/8-WL high antenna appears to have more
radiation toward the zenith than does the 1/4-WL high antenna.

I don`t know why, but would speculate it is due to closer coupling of
the radiator with the earth which gives the reflector (earth) more
energy to work with on the reflection. Maybe I`ll learn something from
this bum steer. I learn something nearly every day here and find this a
rewarding experience.

Best regards, Richard Harrison, KB5WZI

Max:

It appears you are overlooking the very useful possibility of using
different antennas for transmit and receive. If the computer RFI problem
can be addressed, then use the vertical for transmitting, and whatever is
quietest for receive.

--
Crazy George
Remove N O and S P A M imbedded in return address
"VE3TMT" wrote in message
...
I have come to the conclusion the only antenna I am going to be able to
use
is a ground mounted dipole or random wire. No antenna supports in the
yard,
no fences, no attic. I tried a vertical "flagpole" but it is just too
noisy.
Nothing but me and the yards of my two neighbours. I am able to run about
60 feet of 22 gauge green enameled wire along the length of the yards. I
have done extensive reading on NVIS propagation, but I'm curious if anyone
is actually using this method on 160, 80 or 40m.

Thanks,

Max

"'Doc" wrote in message ...
Max,
If nothing else presents it's self, you might try a
'CCD' (Controled Capacitance Distribution antenna). The
biggest draw backs are that they are a wave length long
and use silver mica capacitors that are not cheap. But
it can be laid on the ground and they do work. There's
a pretty good writeup in one of the ARRL's Antenna
Compendium books, not sure which one. It wouldn't be my
first choice in your situation, but it is an alternative.
'Doc

Thanks Doc, I'll look into it. At this stage in the game I am open to any
suggestions!!

On Fri, 05 Dec 2003 13:03:34 -0600, Bob Miller
wrote:

On Fri, 05 Dec 2003 18:52:30 GMT, Richard Clark
wrote:
What few dipole users would admit (because they love to crow about not
having radials) is that if you add radials, you can further improve
your dipole performance up AND tangentially.

Where would I attach radials on a dipole?


Hi Bob,

Not to the dipole certainly; to the ground below the dipole. It is,
after all, the ground that presents the loss. The radials reduce that
loss as is their function.

For example, a 20M dipole one halfwave over a ground mat (1M grid
about 1 wavelength in XY dimension), shows a gain of 7dBi at 30°.

Take away that ground mat, it shows a gain of 6.5dBi at that same 30°.

Nothing remarkable in my book, but I have the ground mat anyway.

73's
Richard Clark, KB7QHC

MD wrote:
Can you not put a small pole at each end of the building and hang a
doublet?

How about a loop or doublet on small stand offs attached to the eaves of
the
building?

A pair of moble whips set up as a dipole on a pole somewhere?

A perusal of the ARRL Antenna Book for other ideas?

--
Jim Pennino

I'm located on the ground level of a two level apartment. Balcony overhangs
my yard, which would be great to hang something off, but it is a strickly
"no antennas allowed period" building. I thought about a dipole using a
pair of hamsticks, but I would have to go out and change them to operate
different bands. And the height would not be great. If I stick anything
under the balcony above me it picks up too much electrical noise from the
building. There are wall supports at each end of the balcony, approx 50'
total length, but my feedline would be visible. My main intention is to get
something, anything hidden so I can spend the winter nights warm in the
shack. I am house hunting next year!!!

Max

Unless you use an autotuner, just about anything you do will require
changing something to work multiple bands.

How about a collapsible pole with a pair of whips on the end hung off
your window/patio with clamps. Put it up after night falls and take it
down before morning.

A pain in the butt but extra motivation to go house hunting.

--
Jim Pennino

Remove -spam-sux to reply.

On Fri, 5 Dec 2003 14:13:37 -0500, "VE3TMT" wrote:

My other alternative is a 8' CB
whip with a flag on the top, which has been up before without any problems.
This antenna is however too short to load on 40 with the tuner.

Interesting. How about mounting the whip on a small bike (for
extra height) and attaching an orange pennant to the top? Looks just
like the things some parents have their kids use for visibility when
riding near cars. Should questions arise about the feedline -- uh,
it's for theft-proofing?

On Fri, 5 Dec 2003 14:13:37 -0500, "VE3TMT" wrote:


"'Doc" wrote in message ...
Is there any way you could
attach a wire doublet of some length to the eaves or peak of
your roof? Doesn't necessarily have to be of any particular
lengths or symetrical shape Longer is better), although that
would peobably help. Any height is better than no height,
as you'll be finding out...

Hello Doc,

I am on the ground floor of a two level apartment building. No roof to get
at and no eaves. My unit itself has 3 floors counting the basement where
the shack is. I was running a vertical, about 25' hung from under the
balcony above me, totally invisible, except being so close to the building
itself, the noise levels on 40 and 20 made those bands useless. Also being
vertically polarized, it was causing RFI on the computer upstairs, and
probably the neighbours as well. I have no way of running anything
horizontal above the ground as this would involve climbing and hard to do
that without the neighbours noticing. I have a feeling the property managers
will be doing some work on the balconies in the spring anyway, so the
antenna would surely be noticed then. I think I am going to go for the
ground laid antenna and hope for the best. My other alternative is a 8' CB
whip with a flag on the top, which has been up before without any problems.
This antenna is however too short to load on 40 with the tuner.

Thanks for all the input guys, I will scratch my head some more, maybe I
will think of some way to hang something from the balcony.


HI all

In your Circumstance I would opt for a small transmitting loop.. that
you could set out when on the air and bring in when not.. Though the
small loop is very Hi-Q and has to be retuned every few KHZ. it would
be a good compromise for you as they work really well when mounted
vertically close to the ground. they offer all radiation angles from
0 to 90 degrees and will give you plenty of qso's .. give it some
thought and I bet you can even find ways to hid one.. in the yard.

73 , Dave KC1DI

P.S. a google search for small transmitting loop will return numerous
pages to explore on the topic.