[Antennas] "Com-Rad" restricted space antenna

[Hue Miller]

Say, gang, in my papers i came across a brochure from Com-Rad Industries with a postmark
of 1981.  This is a restricted-space antenna. The antenna consists of, at bottom, one or two
metal cylinders, maybe the size of a deskside wastebasket, metal, but with no lid or bottom.
Above, attached by jumpers to these "ground metal" cylinders, is a coil made of tubing,
looks like maybe 8 inches diameter, set vertically.  The coil for 80-40 looks like maybe 20" long.
These figures are just guessing from a not too large photo in the brochure. Above the coil
is a horizontal metal rod  maybe 36 inches long. So basically it looks like just a good
loading coil, with a capacitive hat, and the "whip" portion of a "mobile antenna" shrunk
down to almost nothing. Oh, yes, on 80-40 the 2 ground cylinders look like they're set on
the floor about 4-5 ft separated.  And also, there's a jumper to short turns on the coil.

The claims:
"The large helix [ large coil of tubing ] in our design is a vertical antenna but is a little
quieter
because the windings of the helix follows an essentially horizontal path".

Does this sound likely? I dunno.

"A 250 kHz band-width exists on 75/80 meters, for example, compared to the usual 15-20
kHz found in miniature antennas much larger than the Com-Rad  units........
The bandwidths previously described are achieved by keeping the vertical section,
which does the radiating, very small compared to the capacity modules [ those cylinders
on the floor ]  with which they are used."

I don't get how this gives wider bandwidth without readjusting the coil. With a coil
made of copper tubing this size, seems to me that is going to be a hi-Q circuit, and
that means narrow bandwidth.
In fact, i kinda don't see how this antenna is basically any different from the mobile whip
antenna. You could just hook a mobile whip antenna, one with a good quality loading coil,
onto a metal garbage can, and get the same results- that's what i think. About the noise
reduction, i dunno, sounds good but i would have to hear that.
As Kurt N. Sterba has said, anything will radiate, even a grocery cart.
Any comments?
-Hue Miller