I can’t contribute to this from my own knowledge; but if it helps there are two sections of ON4UN’s “Low-Band DXing” that might be of interest. In Chapter 5 (with consulting author, Lew Gordon K4VX) at pages 5-5 and 5-6 appears to illustrate significant effects from sloping terrain; and at page 9-5 (with consulting author Uli Weiss DJ2YA) says directly, “Fig 9.6 shows that a terrain that slopes downhill in the direction of the target is as helpful for vertical antennas as it is for horizontally polarized antennas.”
I would also use this opportunity to thank more than a dozen people who replied off-line to my original post, in which I asked for advice on weighing the disadvantages of longer feedline runs against the gains from sloping terrain. All of it was helpful and I got a much-needed education. Many thanks.
Ted, KN1CBR
>
> On 7/13/2016 10:38 AM, David Gilbert wrote:
>>
>> No, I didn't mean that.
>>
>> If sloping ground improves radiation pattern, it's going to be worth
>> more than 1 db. Pattern changes of any sort typically have
>> significant effect, whereas one db is almost trivial (notwithstanding
>> my own experiments on that on my website). I'm not saying that
>> sloping ground actually has a significant effect ... only that if it
>> has any effect at all it is likely to be greater than 1 db.
>>
>> Dave AB7E
>>
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