[TowerTalk] 20m monoband Yagi height

[Dave Hachadorian]

I have a 48' tower, and have modeled the advantage of going to 70'.  Over 
flat terrain, the models show an advantage of 2 dB at all of the useful wave 
angles.

Dave Hachadorian, K6LL
Yuma, AZ

-----Original Message----- 
From: Robert Gerace
Sent: Tuesday, July 14, 2020 9:24 AM
To: towertalk at contesting.com
Subject: [TowerTalk] 20m monoband Yagi height

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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