I used to operate at N3RS, who has 5/5/5 on 20, 5/5/5 on 15, and 5/5/5 on 10.
I forget the specific stacking heights/distances, but IIRC, they are 20:
37/77/117 feet, 15: 47/77/127 feet. 10: 25/50/87 feet.
I am using 2 C31XR tribanders at 40 and 80 feet, with separate feedlines. On
10, I have added a 5 element 10 at 25 feet, so while the distances are a
compromise, I will have 3/3 @ 40/80 on 20, 4/4 @ 40/80 on 15, and 5/5/5 @
25/40/80 feet. Which seems very similar to Tim's and well as Sig's stacking
distances and heights.
I used HFTA not for the gain numbers, but as someone else pointed out, to
eliminate or move the nulls for the arrival angles from Europe (mainly) and
other directions.
As John also pointed out, I only have 1 tower, and the C31XR's are just above
the guy wires. So that's what I have, and I have no plans to take the tower
down to reconfigure the guy wires. I know some guys have tribanders at
30/60/90 feet, but I chose not to do that.
Tom, N2SR
From: "john@kk9a.com" <john@kk9a.com>
To: towertalk@contesting.com
Sent: Wednesday, August 10, 2016 7:58 AM
Subject: Re: [TowerTalk] Stacking question - another reality data point
These are logical stacking distances and will definitely work well for
most stations. Most of us do not have dedicated towers for each band and
we have to adjust the spacing and heights to clear guy wires and other
antennas. Fortunately spacing distance is not overly critical. I use
similar but slightly larger spacing and similar low antenna heights to
K3LR except on 40m.
John KK9A
To: <k1ttt@arrl.net>, <towertalk@contesting.com>
Subject: Re: [TowerTalk] Stacking question - another reality data point
From: "Tim Duffy" <k3lr@k3lr.com>
Reply-to: k3lr@k3lr.com
Date: Tue, 9 Aug 2016 21:06:54 -0400
I have 41 years experience in stacking 2, 3 and 4 Yagi's high.
After many hours behind the HFTA and NEC model engines - then putting Yagi's
up in the air and using them for many years here at K3LR - these are the
stacking distances that have worked very well at this Western PA QTH:
Lowest Yagi height:
40 meters - 118 feet
20 meters - 50 feet
15 meters - 40 feet
10 meters - 33 feet
Then - stacking distances by band:
40 meters - 72 feet
20 meters - 60 feet
15 meters - 40 feet
10 meters - 33 feet
All OWA Yagi's on all bands at K3LR have booms that are 48 feet long (it
makes a difference).
73,
Tim K3LR
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