Combining helix antennas - spacing required

Chris G8BKE

Can anyone help with a value for the horizontal boom spacing required between two, 35 turn helices,
to give effective combining at 1700Mhz. There seems to be quite a range of values given in web
articles, starting at 1.5 x wavelength and increasing to 5 x wavelength . Which if any are

73 de Chris

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