Re: Many microwave ovens leak microwaves
So even if you are at the bottom of the tower it is still a distance from you.
Even more contributing is the antenna's radiation pattern. [1..n]G masts, as well as most WiFi APs and the like have an elevation pattern looking like a pillow, or even a pancake. Which makes sense as there's no point in sending energy upwards, especially straight up, if there's no client that way. And as elevation patterns are mirrored along the horizontal (or rather along the main elevation lobe, which _can_ be tilted) there's also very little energy going down.
Which caused mobile coverage to be rather shit with our previous provider, whose antennas were on top of our office.