[TowerTalk] Is there a point of diminishing returns on gain for stacking HF beams?

jimlux jimlux at earthlink.net
Tue Jul 15 06:38:39 EDT 2008

  KZ4USA wrote:
> Like stacking tribanders or monobanders for HF 10 thru 80? 
> Or does it keep climbing up 3db?
> _______________________________________________

Well.. in free space you get a gain of N, for N antennas.. 2 antennas is 
3dB, 4 antennas is 6dB, etc.

And that assumes they're far enough apart vertically (on the order of 
1/2 wavelength), and that ground reflections aren't a factor (so for 
most ham's systems, which are within a few wavelengths of the ground, 
you can't just stack ad infinitum).

The HFTA program that comes with the ARRL Antenna book lets you experiment.

Jim, W6RMK

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