This article is from the Satellite TV FAQ, by Gary Bourgois flash@lopez.marquette.mi.us with numerous contributions by others.
Not if you have a chain saw. Trees in the way mean you don't get a
picture, at least in the summer time. Trees have a tendency to block the
microwave signals. If you are not sure of your situation, it is advisable
to have a "SITE SURVEY" done by a local dealer. This should cost you no
more than about $25. Usually you can find SOME place to put the dish to
see the satellites, and mounting on a pole or your roof may help the
situation. I have a similar situation here, and my dish is 26 feet high, and
includes a massive steel reinforced wooden structure complete with a service
platform. This helped me clear the tree line enough to actually get FOUR
international satellites. Obtaining permission from the city to build this
structure was a bit of a hassle, but thanks to the material from ASTA, I was
able to convince them that under the Federal Pre-emption the city could not
deny the installation. I now have perfect reception of the entire satellite
arc.
 
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