[TowerTalk] 20m monoband Yagi height

[Robert Gerace]

Thank you all to everyone who answered. All answers were helpful!

Special thanks to AB7E for answering the question off line with graphics
that answered my questions so completely that I learned answers to
questions I should have been asking but didn't know to ask!

73
Bob
KD4Q

On Tue, Jul 14, 2020 at 1:17 PM W0MU Mike Fatchett <w0mu at w0mu.com> wrote:

> I believe that 100 ft is a desirable height for 20m.  I have always had
> 70ft towers, which seems to be a good tradeoff for a tribander.  70ft
> will be better than 50ft, but both probably work just fine for 95 of
> what you might be doing.  I was going to stack tribanders at 70 and 40
> feet.  I was more into domestic contests so the lower height of the 2nd
> antennas plays into that plus it helped with some terrain issues filling
> in some path angle gaps.
>
> You can model this this HFTA  or HTFA and see for yourself if the extra
> height is worth it.
>
>
>
> On 7/14/2020 10:24 AM, Robert Gerace wrote:
> > Please forgive my inability to figure out how to search archives by
> subject as I have to imagine this is a common question.
> >
> > Understanding the best answer is “as high as possible” and the second
> best answer is at least one wavelength...
> >
> > I wanted to ask about some real world experience between 50’ and
> 66-70’...
> >
> > Specifically: given the same antenna, same QTH, same general point in
> the solar cycle...
> >
> > Has anyone had a 20m monoband, trapless beam at ~50’, then raised it to
> ~70’ and seen enough consistent improvement to justify the effort?
> >
> > Background:
> >
> > Given my QTH I have about 55’ to tilt my (in process of permitting)
> tower. If I want to go higher I’m clear to 70 easy. However it will require
> telescoping (e.g. lower to 55, then tilt) to be able to service from the
> ground — a requirement for me.)
> >
> > The cost difference is very substantial all the way around: purchase,
> shipping, footing, installation).
> >
> > So I’m wondering if it’s worth all the time and trouble to get an extra
> 15-20 feet?
> >
> > Background: I’d like a big signal, would like to have at least a 50-75%
> chance to bust most pileups... even if it takes patience...but I’m a casual
> DXer who after 44 years is getting serious about 20m CW DXCC.
> >
> > I’m not trying to be the guy who is first through the pileup or even
> places in a DX contest... but I’m tired of being the guy who can only reach
> for low hanging fruit. I want to work some more dopamine inducing DX and
> maybe turn in something more than average on contests.
> >
> > I live in NE FL, a mile from the beach, on very sandy soils, and have
> oak trees at 45’.
> >
> > Any insight appreciated.
> >
> > Thanks es 73
> > Bob
> > KD4Q
> >
> > Sent from my iPhone
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