[Antennas] Anyone remember the Caged Dipole?

[Harvey&Bessie]

	The cage dipole was designed to be much broader bandwidth than the
simple one-wire dipole. RF wise it makes no difference whether a larger
diameter of the antenna conductor is achieved by making the antenna of a
single larger conductor such as tubing or by making it of several wires
in the form of a cage. This idea was first used for the downleads of
low-frequency antennas such as "T"s or "inverted "L"s when it was
desired improve the efficiency of these antennas by reducing losses in
their down leads where most of the current was flowing.
	The cage for a dipole configuration can consist of wires evenly spaced
around circular spacers all the same diameter or can be made in a
conical shape, where the separate conductors are close together at the
feed point and more widely separated toward the ends. Quite a degree of
broadbanding can be achieved by such an arrangement.
	The cage dipole lost its favor among amateurs with the advent of
co-axial feed lines. The center impedance for these broader bandwidth
dipoles increases in proportion to how much broadbanding is achieved,
generally being in the range from 100 to 200 ohms.
Harvey/W4TG
	When this subject was brought up I looked for references in some of my
handbooks and I couldn't believe it, but they seem to ignore it
altogether! The nearest thing to it is in Bill Orr's Handbook (1970) on
page 482, Fig. 12 "Broadband Antenna With Quarter-wave Balun Feed
System." And in the Radio Amateur's Handbook (ARRL) for 1971 where it
discusses a 3-wire folded dipole on page 362, Fig. 14-10.