Hi Dave.

Thanks for the info.

Your message was quite helpful.

When you put up that alpha delta how are you supposed to fan out the wires?

Can you treat all three as dipoles one below the other parallel to each 
other or areyou supposed to fan them out   or are they incorporated in 
to one wire so to speak with three separate wires attached to each other?

This is the way the cobra ultralite antenna is made which is another one 
I am considering.

Don


On 12/18/2014 12:45 PM, David Weigel wrote:
> 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