Here is a chart of what the EME'rs are doing for spacing on 2m. Scale
by exactly 3 for 432 for your boomlength.

http://www.vhfdx.net/VE7BQH.html

And here is the DL6WU stacking formula -

--------------------------------------
DL6WU Stacking Formula for Long Yagis

D = W / (2 * sin(B/2))

* D = stacking distance, vertical or horizontal
* W = wavelength, in same units as D
* B = beamwidth between -3dB points.
Use vertical beamwidth for vertical stacking (as above);
use horizontal beamwidth for horizontal stacking.
---------------------------------------

Or you can do it using YO, EZNEC, etc., and increase the spacing until
the first sidelobe is minimized, and the next stacking distance step
makes it larger. I think that's at 13dB down, but I could be wrong,
17dB also sounds correct.

tom
K0TAR

ab5mm wrote:
Hi group... Need some input.

I need to stack two 432mhz quads, not in the traditional vertical plane,
but horizontal. This brings me to two questions... (1) What distance
apart? 1/2 wave length or 1 wave length or ?? (2) Do I need to make
that measurement from boom center line to boom center line OR would it
be end of element to end of element?

Thanks & 73,

Steve
ab5mm

How big are the antennas? The pattern can get pretty sharp and hard to nail on
the station you're trying to peak. No doubt you'll be loud once you're there,
but the wind may blow you off track.

jw
K9RZZ

I verified that just about 13 dB down on the first sidelobe gives you
the best pattern, and is about .2 down from highest gain.

tom
K0TAR

Tom Ring wrote:




Or you can do it using YO, EZNEC, etc., and increase the spacing until
the first sidelobe is minimized, and the next stacking distance step
makes it larger. I think that's at 13dB down, but I could be wrong,
17dB also sounds correct.

tom
K0TAR