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Old June 22nd 09, 07:03 PM posted to rec.radio.amateur.antenna
Gary KW4Z Gary KW4Z is offline
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First recorded activity by RadioBanter: Jun 2009
Posts: 3
Default Can you ID this antenna

On Jun 22, 8:07*am, "Dale Parfitt" wrote:
"Gary KW4Z" wrote in message

...



The other day, while passing the local Reserves building, I noticed a
new antenna mounted to their tower. *It was in an inverted Vee form
but had approximately three white insulators that were around 6 to 8
inches in length running between the two wires of this antenna. *The
antenna was fed, via coax, from the bottom by what appeared to be a
balun. *The wire proceeded out from the balun past the bottom of the
three (per side) insulators and at each end appeared to either double
back, upon itself, or be attached to the top wire which was connected
to the bottom wire at each end then passed through the top of each of
the three (per side) insulators and ended up meeting the other sides,
top wire, at, what appeared to be, a plastic mounting plate that
served as a fastening point for each of the top wires and also as a
top support for the antenna's middle to be connected via rope, wire,
etc to either a tower or mast. *The top (middle) of the antenna had no
contact with the bottom middle (of the antenna), where it was fed
from, but the top and bottom wires (isolated from each other as it ran
from the middle to end, by three white insulators approx 6-8 inches in
length) *The only contact of the top wire to the bottom wire was at
the extreme ends of this inverted vee type antenna where the top and
bottom wires were attached to each other then each end mounted, via
insulator, to some connecting point to support the height of the ends
of this antenna.


I've just never seen this type antenna and would love to build one.
If you know the type, from the description I have given, please share
the name of it and where I might be able to obtain the forumulas for
calculating length. What bands does it work? *Is it homebrew or
commercial?


Any input would *be appreciated.


Sounds very much like B&W's "folded dipole". I use quotes because in their
version they have a resistor *at the center of the unfed wire that absorbs
power and smooths out the VSWR.http://www.bwantennas.com/ama/amaindex.htm
Dale W4OP


Dale,

Though not exactly like the B&W antenna that you linked to it is
similar enough that I feel it has to be based upon that antenna
design. Jimmie, I'm sorry I totally lost you in the description.
I'll see if I can get a photo however all of you are aware of the
security precautions since Sept 11. My apology if the description was
not concise enough to enable you to identify.