Hi Greg: The HF antenna question is the easiest to answer. There should be
little or no coupling between the vertical 10m ant and your tribander so
spacing is not a problem. I assume the vertical does not have radials or
they could couple to the yagi. A vertical without radials high above ground
is usually not a very effective antenna.
The VHF/UHF situation is not quite as easy. The dual band vertical will
couple to the vertical 2m yagi so spacing is a factor. Does it have radials?
Also, will you mount the 2m yagi so that the mast does not go up between the
elements? It would be best if it is mounted off to the side of the mast with
a bracket. This is strictly a guess but I would try for 3-5 foot spacing
between the vertical antennas. The 6m beam will probably be OK with 3-5 ft
spacing I would guess.
73, Dan, N5AR
---- Original Message -----
From: <goneil@tds.net>
To: <towertalk@contesting.com>
Sent: Wednesday, July 23, 2003 10:05 AM
Subject: [TowerTalk] spacing
> Hi,
> I have a question or two concerning spacing of antennas. First I'm
relatively new to Amateur Radio and as such need some advice. I'm putting
up two towers soon and intend on using one of them for VHF/UHF applications
and the other for HF. I intend to place 3 antennas on the tower designated
for VHF/UHF. I currently have a verticle that does 2m/70cm that I intend to
place on the very top. I also intend to place a 2m beam vertically
polarized underneath the vertical and then a 6m beam horizontally polarized
below the 2m beam. My question is, how far should these antennas be
seperated vertically? On the other tower I will have an A3S tribander just
above the top of the tower, and would like to place a 10 meter vertical
above that tribander. How far above the tribander should the vertical be
placed? I know I don't have a clue as to the spacings needed so I'm
depending on the ones on here that do.
> Thanks
> Greg O'Neal KG4UZN
>
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