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Hi there,


Well lets give it a try,


Looking at the gain that will not be possible.

With the described boomlengths the yagis would be more in order with these numbers:

3el approx 7..8 dBI.

4el approx 8..9 dBI.

5el approx 9.5...10.5 dBI.


Dont look to much to the FB.  As the gain the numbours vary along the frequency.

Unless you have a screenplot with the FB and overlay that with a "comparable" the numbers wont say too much...

(The fB could be at its weakest point for instance -20dB over 10degrees...and on the edges the FB drops over towards -40 dB. Where anohter yagi could have -30 dB over the entire back...now wich one is better?)


About the beamwidth...Yes indeed the beamwidth would become smaller with the increase of gain.


A 3el has approx:90 degrees

A 4el has approx:80 degrees

A 5el has approx:70 degrees


The gain difference between a 3el and a 5 el would only be about a half S-unit if measurerd correct. (our S meters are always way optimisitic!)


The biggest differece is going to be found in the smaller beamwidth and better overall pattern. Do not underestemate the bennefit of having a small beamwidth!...


Normally you can say:

Doubling the boomlength will add about 3dB. 2..3..dB is the first a human ear is capable of hearing.


I have two other sugestions....

I dont know your present heigth of the antenna...but heigth is important...

Overall..a 3el at 60 feet will outperform a 5 elements at 40 feet (in DXing).


Secondly how about stacking two 3el ? Stacking two 3el will give about the same results as a single 5el (when done correct)>

And when placed vertical...that will improve the pattern of the beam as there is no mast in between the elements...


Interperting that you already had your old antenna up for about 10..15 years...

Brings me the thougth that u r a "steady" person with regarding to antennas and want to have it for a long lasting solution.

Personal i would leave the thougths of "TV-rotator"

I would recommand using anything a bit large than a TV rotator for the 4elements aswell...


Kind reagards,


Henry