http://www.baristanet.com/cell%20tower.jpg (not hidden)
http://www.macguys.com/wp-content/up...mCellTower.jpg (palm tree)
http://www.unplggd.com/uimages/unplg...08_sz_palm.jpg (palm tree)
http://blog.silive.com/latest_news/2...large_cell.jpg (I dont know what is going on)
The last one doesn't have any attempt to hide it. If appearance was a consideration, I think there are radio transparent materials that can be used as a fascia, it could be done in a way to make the building look taller.