Yagi in between V/H

[wavrider]

MOGVZ, nice chart,

Gain was not the topic of discussion, the TOA and AOA is what allows the vertical at lower heights to perform.

Example, 102" steel vertical mobile antenna can work DX mounted to a vehicle only 1.5 meters above ground.

Try mounting a yagi at that same height and see how much of a cloud burner it will be??

Frequency DOES MAKE a difference in the discussion, as 40 meters damn sure propagates different than 11 meters.

if all frequencies propagated the same then the solar -terrestrial data A and K index numbers does not mean shit as to what bands are open?

I did not contradict myself, the yagi is quieter on receive if it is horizontal, no matter what height it is installed at, it does have gain on receive as posted, it is the TOA and AOA that makes the difference.

 

[wavrider]

http://www.dx-antennas.com/Height versus take off angle.htm

http://wb2lua.com/papers/HF_Antenna_Analysis.pdf

interesting reading, second link pretty much paints the picture of vertical vs horizontal for TOA.

 

[Road Squawker]

..., the vertical will out perform the yagi on long distance multi hop nine times out of ten for TX....

all I can say is , that is not my real world experiences,............. YMMV

 

[wavrider]

all I can say is , that is not my real world experiences,............. YMMV

Agreed, everyone has their own experiences.
Not arguing by any means, in fact I agree that the horizontal dipole or yagi is the better all around antenna, as MOGVZ pointed out over a century of experience.

On the other hand if one can not install a dipole at 1/2 wl AGL , then the vert will work fine, in fact the dipole needs to be about 1 1/2 wl AGL to get the same TOA as the vert does at ground level,
OF course the dipole and Yagi has more gain, but then we are not discussing gain here.

Picture is worth a thousand words,

H.F. Antenna Analysis
Dr. John A. Allocca, WB2LUA, 2004


Comparison of 1/2 Wave Horizontal Dipole, Yagi, and Vertical Antennas - 7 MHz
 Horizontal dipole
 Horizontal Yagi
 Vertical Dipole
The horizontal dipole’s maximum gain (5.89 db) is obtained at 59 degrees.
The horizontal Yagi’s maximum gain (8.40 db) is obtained at 44 degrees.
The vertical’s maximum gain (0.24 db) is obtained at 16 degrees.
The horizontal dipole has the widest overall coverage.
The Yagi offers slightly more gain at slightly lower radiation angle than the horizontal dipole.
The vertical has more gain at lower radiation angles, excellent for long-range transmission.