On Saturday, 25 January 2020 00:02:48 UTC, tony sayer wrote:
In article , Bill
Wright scribeth thus
On Thursday, 23 January 2020 14:42:55 UTC, charles wrote:
Hills can also create multipath

I've always thought (or assumed) that rounded hills don't so much reflect the
signal as screen it, thus making reflections from other things more significant.

Having messed around with directional aerials in mountainous areas I've come to
believe that rocky outcrops reflect signals more than other features. I've seen
very striking examples of that.

Bill

Edge diffraction there is a good article on it somewhere, can't think of
it right now tho..

Edge diffraction! Six miles from a high powered TV tx. Rounded and bare heap of colliery waste in way. Move the rx aerial vertically up and down and there will be distinct peaks and nulls.
Bill