A good rule of thumb is to look up the stacking distance for the
individual antenna (you do not provide enough information to know
what they are) and place each antenna at least 1/2 the stacking
distance (which is approximately 2 x the capture area) away from
any lower frequency antenna.
A good place to start is at 1/2 wave for antennas with booms less than
one wavelength (e.g. 5 elements on 6 meters) and use 1/2 the boom
length for antennas more than 1 wavelength long (e.g. more than 6
elements for the typical 2 meter designs). There are more rigorous
calculations in the various UHF/VHF antenna books but "half the boom
length with a 1/2 wave minimum" will get you "in the ballpark".
73,
... Joe, W4TV
On 2014-09-18 1:11 PM, Marv Shelton wrote:
I'm about to complete my annual tower work and have added a few new antennas to the mast.
I have done some reasearch but found conflicting information on how far apart to
seperate antennas on one mast. The info that makes the most sense talks about the capture
area of the antenna. I am looking at a "stack" consisting of a tribander, a 6m
beam, and beams for 144, 220, 440 and 1296 MHz.
Does anyone here have experience or a link to so e good reference material
about how far apart to place these antennas? I have about 15 - 17 feet of mast
to work with.
Marv - WA2BFW
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