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I also have thought this about modelling.. it would be nice for example to model sloping ground and its possible influences. I am skimming this at the moment due to lack of time.

I do know that the faster a slope off gradient on a hill the better the influence on lower angle radiation. This in theory and in practice as at one such location I use for DXing I produce a surprisingly huge signal to countries 5-6 thousand miles away broadly in that direction with just a vertical that has a steep/fast slope away. I suspect it greatly increases 10 degrees and lower radiation. Clearly the altered ground reflection from the steep slope creates constructive phase interaction/ interference at a significantly lower angles.

I have been thinking about this quite a lot recently regarding QTH's and different bands and that what may work well for one may possibly not work well for another band. Given we know as HF frequencies go upwards DX radiation angles on the F2 layers hop drop.

<blockquote data-quote="TheBlaster" data-source="post: 777400" data-attributes="member: 58745">I also have thought this about modelling.. it would be nice for example to model sloping ground and its possible influences. I am skimming this at the moment due to lack of time.I do know that the faster a slope off gradient on a hill the better the influence on lower angle radiation. This in theory and in practice as at one such location I use for DXing I produce a surprisingly huge signal to countries 5-6 thousand miles away broadly in that direction with just a vertical that has a steep/fast slope away. I suspect it greatly increases 10 degrees and lower radiation. Clearly the altered ground reflection from the steep slope creates constructive phase interaction/ interference at a significantly lower angles.I have been thinking about this quite a lot recently regarding QTH&#039;s and different bands and that what may work well for one may possibly not work well for another band. Given we know as HF frequencies go upwards DX radiation angles on the F2 layers hop drop.</blockquote>

[QUOTE="TheBlaster, post: 777400, member: 58745"] I also have thought this about modelling.. it would be nice for example to model sloping ground and its possible influences. I am skimming this at the moment due to lack of time. I do know that the faster a slope off gradient on a hill the better the influence on lower angle radiation. This in theory and in practice as at one such location I use for DXing I produce a surprisingly huge signal to countries 5-6 thousand miles away broadly in that direction with just a vertical that has a steep/fast slope away. I suspect it greatly increases 10 degrees and lower radiation. Clearly the altered ground reflection from the steep slope creates constructive phase interaction/ interference at a significantly lower angles. I have been thinking about this quite a lot recently regarding QTH's and different bands and that what may work well for one may possibly not work well for another band. Given we know as HF frequencies go upwards DX radiation angles on the F2 layers hop drop. [/QUOTE]

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