In article . com,
"RHF" wrote:

For One and All,
.
How Long Should My Slinky Antenna BE ?
- - - How Many Slinkys You Got ?
http://groups.yahoo.com/group/Shortw...a/message/5411
.
The standard Full Size Slinky has about 100 Turns with a
Diameter of 2 3/4 Inches and a Circumference of 8.64 Inches
for a Total Wire Length of 72 Feet.
.
So the Optimum* "Stretched-Out" Length of a Slinky would
be about 22.9 Feet. * Note - Based on the "Spacing" of
the Coil being 'equal' to the Diameter of the Coil.
.
.
SIZING THE SLINKY DIPOLE ANTENNA :
.
A Two (2) Slinky Dipole (1 Slinky per Arm of the Dipole)
would be about 45.8 Feet Tip-to-Tip; and that would be
Resonant about 10.6 MHz. Rig the Dipole Antenna at about
23 Feet above Ground.
.
A Three (3) Slinky Dipole (1.5 Slinkys per Arm of the
Dipole) would be about 68.7 Feet Tip-to-Tip and that
would be Resonant about 7 MHz. Rig the Dipole Antenna
at about 34 Feet above Ground.
.
A Four (4) Slinky Dipole (2 Slinkys per Arm of the Dipole)
would be about 91.6 Feet Tip-to-Tip; and that would be
Resonant about 5.3 MHz. Rig the Dipole Antenna at about
46 Feet above Ground.
.
A Six (6) Slinky Dipole (3 Slinkys per Arm of the Dipole)
would be about 137.4 Feet Tip-to-Tip; and that would be
Resonant about 3.5 MHz. Rig the Dipole Antenna at about
69 Feet above Ground.
.
Any Comments and Corrections ?
[ No Rock Throwing - Please ! ]

Snip

I don't think that using a slinky is very good antenna. You might as
well use a straight wire.

You would be better off using a minimum of three or more parallel wires
through spacers to approximate a cylinder shape. The more parallel wires
you use the bigger the diameter of the cylinder could be.

Using a slinky is convenient and what I advocated above would be a lot
more trouble to make but it would work better.

I haven't owned a slinky since I was a kid.

--
Telamon
Ventura, California