[TowerTalk] Is there a point of diminishing returns on gain for stacking HF beams?
jimlux at earthlink.net
Tue Jul 15 06:38:39 EDT 2008
> 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.
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