How much land is needed for a cell phone tower?

I'm curious to know, how much land area does one typically need to construct a cell phone tower? Are there any standard dimensions or is it dependent on factors like the height of the tower, the terrain, or the proximity to residential areas? Additionally, does the amount of land required differ significantly between urban and rural settings? It would be helpful to have a rough estimate of the land area required for a typical cell phone tower project.