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Yes, the trees and buildings almost always require a correcting elevation at the receiving end. Like your pine trees, the Douglas Firs here in the NW can require a 100' correction to the terrain model.
I wonder how soon we can expect the publicly accessible terrain mapping databases to include vegetation and structure detail. (When I started my career at the phone company the internet, cell phones and PC did not exist.)
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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