Take a look at
http://www.dvbresource.com they have a review about
the ds-2076 dish and a work around for the lower elevation problem.
Also I remember reading somewhere that there is a winegard technical
bulletin out on that problem. Theres a bolt that you turn around that will
get you down to 20.5 degrees. To go any further you have to change the
angle of the mounting post.
Best Luck!