[Towertalk] Verticals on sloping hills?

[K3BU@aol.com]

Not to rain on tower discussion, 
but I have this question about the verticals installed on the sloping 
terrain, like hillside. I have been to the ocean front and seen the benefits. 
I wonder what the sloping hill would do to the vertical antenna performance. 
What does it do to far field and radiation pattern at low angles. Any 
practical experiences or clues from the terrain modeling out there?
Way to eliminate towers?  :-)

Yuri, K3BU