Howdy,

The thing I have noticed in my travels is that most of the quad antennas I've
seen are CB antennas.

And many of them are damaged presumeably by the wind. I seem to see the wires
"blowin' in the wind".

It's hard to beat a Yagi for gain, performance, durability, weight, cost,
ability to match, etc.

73, Jack K9CUN

It's hard to beat a Yagi for gain, performance, durability, weight, cost,
ability to match, etc.

73, Jack K9CUN



Properly designed and built Quad will beat Yagi in all the above mentioned
"parameters". Little more cumbersome to raise on a tower with guy wires, but
easily doable.

Yuri, K3BU.us

Yuri, K3BU wrote:
"Properly designed and built Quad will beat Yagi in all the Above
mentioned "parameters"."

The author of "All About Cubical Quad Antennas", Bill Orr, W6SAI says:
"The power of the 3-element or 2-element Yagi, however, is not swept
aside by the Monster Quad, no matter what the size and power gain of
this impressive antenna."

Orr says measurements with an accuracy of a decibel or better are hard
to believe. His table shows about 1.7 dB advantage for a Quad with 2 or
3 elements over the Yagi, and the boom length may be about 2/3 that of
the Yagi, he says the reason for building a Quad instead of a Yagi is
likely a matter of opinion as to the value of the small edge the Quad
may have versus the extra cost and effort to get the Quad up.

Orr says he used both the Yagi and the Quad for years as did many of his
good friends. He says objective and subjective tests show the Quad has a
definite advantage in terms of signal strength over the Yagi antenna.

Best regards, Richard Harrison, KB5WZI

Richard Harrison wrote:
Orr says he used both the Yagi and the Quad for years as did many of his
good friends. He says objective and subjective tests show the Quad has a
definite advantage in terms of signal strength over the Yagi antenna.

It is good to remember that the Quad was invented to solve a particular
problem.

From Orr's book concerning the 4-element Yagi initially installed:

"Totally unexpected, however, was the effect of operating the high-Q
(Yagi) beam antenna in the thin evening air of Quinto. Situated at 10,000
feet altitude in the Andes, the beam antenna reacted in a strange way to
the mountain atmosphere. Gigantic corona discharges sprang full-blown from
the tips of the driven element and directors, standing out in mid-air
and burning with a wicked hiss and crackle. The heavy industrial aluminum
tubing used for the elements of the doomed beam glowed with the heat of the
arc and turned incandescent at the tips. Large molten chunks of aluminum
dropped to the ground as the inexorable fire slowly consumed the antenna."

"The corona discharges were so loud and so intense that they could be seen
and heard singing and burning a quarter-mile away from the station. The
music and programs of HCJB could be clearly heard through the quite night
air of the city as the r-f energy gave fuel to the crowns of fire clinging
to the tips of the antenna elements."

C. Moore invented the Quad beam to solve that somewhat special problem.

Quads also have all the advantages that loops enjoy over dipoles. One
thing that comes to mind is a marked reduction in static electricity due
to wind and snow because the entire loop is virtually at DC ground.
--
73, Cecil http://www.qsl.net/w5dxp



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Quads also have all the advantages that loops enjoy over dipoles. One
thing that comes to mind is a marked reduction in static electricity due
to wind and snow because the entire loop is virtually at DC ground.

A yagi built with "plumbers delight" construction has every element bolted
directly to the metal boom, so every element is at DC ground.

Torsten
N4OGW

Quads also have all the advantages that loops enjoy over dipoles. One
thing that comes to mind is a marked reduction in static electricity due
to wind and snow because the entire loop is virtually at DC ground.
--
73, Cecil http://www.qsl.net/w5dxp



That's what I thought too, I built the quads using insulated wire in hope to
eliminate atmospheric static, but I could barely tell the difference. What made
huge difference (wiping out static completely) is the use of stacked antennas,
or having larger antenna over the one in use. The top one would be 20 over S9
while lower one is dead silent.

Quad advantages: made of wire, no corroded junctions like with Al tubing. Quads
rule up to about 5 el. then Yagis take over. I have 3 el. design that is 50
ohms, no matching, broad band. One advantage quad has that it is only antenna
that can be used for different polarizations with the same hardware. Parasitic
loop doesn't know what polarization it is.

Yuri, K3BU.us