Hello, Don: 
	Your question brings back some memories for me.  When I restarted my
interest in ham radio some 22 years ago, I was living in a ground floor unit
of a 3 story condominium.  My elmer helped me create a "hybrid" G5RV, which
consisted of two 51 foot lengths of wire connected to a center insulator -
erected on the flat 3rd story roof of the condo building.  We ran coax
feedline from the center insulator over the roof of the building, down to
ground level to my transceiver in my condo bedroom.  The antenna worked
grreat (great sunspot cycle propagation helped, I suppose), and I worked the
world from southwest Florida.  I believe that the 34 foot ladder line that
goes with a conventional G5RV could provide adverse effects if it runs along
a rooftop, goes vertical next to a tall building wall, etc.  My suggestion
for the coax - 102 foot dipole configuration would be to add a 1 to 1
current balun at the center insulator, to reduce or eliminate rf along the
feedline.  
	Presently, I reside at a different location, and am using an Alpha
Delta DXCC multiband dipole up about 40 feet.  It has two wire elements of
41 foot length apiece, covering 80, 40, and 15 meters.  It also has separate
wire elements for 10 and 20 meters.  My antenna requires an external tuner
for 75 -80 meters.  I added a 1 to 1 Radio Works current balun at the center
insulator for the coax feedline connection.  (The balun is not suggested by
the manufacturer, but I believe that it is a somewhat sound principle since
no lladder line is used with this antenna, and coax to dipole wire is an
"unbalanced" to "balanced" situation.)  I also have a ground rod connection
to the feedline coax outer shield just before the coax enters my home.  
	The bottom line is that so many variations of this antenna theme
seem to work reasonably well, some, of course, better than others.
Sometimes a little adaption assists the conventional model, based upon local
environment.  And by the way, I'm sure that the DXCC is available from Alpha
Delta and through your favorite ham store.  
	Good luck in your search for a starting point/commitment.  Should be
fun along the way.  

					73 de Dave Weigel     KD4JEZ

-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Don Breda
Sent: Thursday, December 18, 2014 9:18 AM
To: [log in to unmask]
Subject: G5rv versas alpha delta etc.

Hi Listers.

I know this subject has probably been beaten to death over the yerars 
but here goes.

I am going to sneak an antenna on the roof of my apartment building.

Although I could put up a full size 80 meter loop, I am afraid of being 
able to keep it up since it would be installed on pvc pipe attached to 
several vent pipes along the way.

The wire itself can get heavy and once snow comes that gets much worse 
so have  decided to keep it simple and put up something like a g5rv  or 
a carolina windom.

I believe there is also some kind of g5rv copy made by alpha delta and 
some say its a better antenna.

I don't know.

My concerns about the carolina windom are that the feedline radiates.

I believe this is also true of the other antennas I mentioned but maybe 
to a lesser degree.

I really don't want to much radiation from the feedline so as to reduce 
the possibility of interferring wit other peoples equipment in the building.

My primary bands of interest are 40 and 75 but I would like an antenna 
that performs well on as many bands as possible grin!

I know the g5rv is usually very bad on 10 meters and I would like to be 
able to use that band at least once in a while but 75 and 40 are the 
bands I give the highest priority to.

Any suggestions welcomed.


w a 2 i w c

Don