The tower will be 8.5m above immediate ground level, near the top of a hill
on a relatively steep slope facing the ocean. 10m away, the ground drops to
16m below the top of the tower.
The location is at the inside corner of my house and garage, with the open
90 degrees facing a driveway, so there's not much room at the base. There's
open space either on the roof (which has a metal roof) or in the yard on the
other side of the house. The antenna has adjustable element lengths with
coverage from 6m to 40m (UltraBeam, similar to SteppIR). I'm looking for
extra coverage on at least 20m, and hopefully on 15m and 40m as well.
I should have been more explicit in my question. While a vertical is an
option, due to the steep slope and where I would have to put it to have room
for radials, it wouldn't have very good coverage on the other side of the
hill. So I was thinking of a wire-type antenna that could be hung from the
tower. A multi-band inverted-V was my first thought, but EZNEC shows it
would couple with the Yagi when they're pointed in the same direction, while
also adversely affecting SWR (I've also heard from a few hams who say
they've tried such a thing, with bad results; Jim W5IFP's comments to the
contrary are encouraging). The Inv-V is appealing in part because I could
also feed it out of phase to increase high-angle coverage.
I'll take a look at a sloper as Mark N1UK suggested. Maybe with a long
enough stand-off cable from the tower, it wouldn't couple as much.
73, Rick ZL2HAM
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of K8RI
Sent: Thursday, July 05, 2012 7:54 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Second antenna options?
On 7/4/2012 12:59 AM, Rick Kiessig wrote:
> With a tower in-place that doesn't have enough height to stack a
> second beam, and without another high spot to use for something like
> an elevated dipole, what are some good options for a second antenna
> that covers one or two of the same bands as the primary beam?
How tall it the tower and how much free space around it?
73
Roger (K8RI)
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