"Buck" wrote in message
...

A B
\ /
X
/ \
\ /
X
/ \
\ /
X
/ \
\ /
X
/ \
a b

The above diagram represents a piece of material with two wires
wrapped around it. One is wrapped clockwise and the other is counter
clockwise. The first wire is a to A and the second is b to B.

For the sake of discussion I am going to assume the piece of material
is a 1" diameter pvc pipe and the wire lengths are each 16 feet or the
equivalent of a 1/4 wave for 20 meters.

I realize that the inductance will create a variation, but since this
is hypothetical, I am assuming this is a 20 meter antenna. Also
assume it is 20 feet or more above the ground with no ground plane
radials.

There are several scenarios for feeding this antenna. My question is
what kind of performance could I expect by each of the variations
below?

1) Feed ab - This is like a dipole with the elements intertwined.

2) Short AB and feed ab - a closed loop

3) feed Ab - this would require additional wire to reach the ends

4) feed Ab - using bending the pvc like a hula loop.

Thank you

--
73 for now
Buck, N4PGW

www.lumpuckeroo.com

"Small - broadband - efficient: pick any two."

results will be bad, better than a dummy load but not by much. google for
ctha and stop listening to art.

http://www.antennex.com/preview/Folder03/Nov5/ctha.htm
http://www.cira.wvu.edu/index.php?/m.../projects/ctha
http://ieeexplore.ieee.org/Xplore/lo...rnumber=569433