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Re: Topband: Sloping Ground

To: "'VE6WZ_Steve'" <>
Subject: Re: Topband: Sloping Ground
From: "Sam Josuweit" <>
Date: Sun, 21 Jun 2020 12:47:03 -0400
List-post: <>
Thanks Steve,


I ran a very similar analysis using the data from Low Band Dxing and HFTA 
plots. It’s good to hear your real world experience. I think some trenching is 
in my future.





From: VE6WZ_Steve [] 
Sent: Sunday, June 21, 2020 11:26 AM
To: Sam Josuweit
Subject: Re: Topband: Sloping Ground



Yes…I think it would be worth it!

My purpose built low-band remote QTH is on a prominent hill surrounded by 
farmland in all directions.  My QTH at the crest of the hill is about 300’ 
above the surrounding land and it slopes gentle in all directions.  Also my 
Beverage arrays mostly all slope down the hill in each direction.

Anecdotally the QTH seems to perform very well fro DX.


Here is a somewhat qualitative analysis of my hilltop QTH using some data from 
the ON4UN low-band DXing book where he talks about verticals on sloping 
terrain. I make some comparisons to my QTH.

I think its reasonable that some exceptional low-angle take-off angles can be 
achieved when located on a hill.  It may be even possible to approach the 
low-angles seen from sea-side verticals…but NOT the gain seen by a saltwater 
location. The “vertical over sloping terrain” data from Johns book would 
suggest low-angle gain that would be almost impossible to achieve on flat land. 
(up to +11 dB at 3 deg angle)

The caveat to this is whether the long-haul DX wave angles really do arrive as 
low as predicted.


73, de steve ve6wz



Looking for some advice from some of you who have been there and done that
before. I'm looking at moving my 160M inverted L to a new location that
would be approximately 100 feet ASL higher and be on top of a hill with
nearly perfect sloping ground in all directions. This would change my coax
run length from 130 feet to 620 feet. I'm looking at LMR400 to meet my loss
and budget needs. Is the move to sloping ground worth the extra work and
coax loss??


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