http://www.emfnews.org/store/
http://www.emfnews.org/products.html
Cell Towers are the base stations which control cell phone communication. The generic term "cell site" can also be used - to include all cell phone towers, antenna masts and other base station forms. Each cell site services one or more "cells".
Cell tower numbers have grown exponentially in recent years, as service providers raced to improve their coverage.
Increased cell phone traffic also contributes to cell tower density. When a cell becomes too busy, a frequent solution is to divide it into smaller cells, which then require more cell sites.
In 2009 there were over 200,000 cell sites in the USA alone, and 50,000 in U.K.
Cell tower radiation from chimneys?
Cell sites may take the form of a mast or tower, but may also be disguised, in some cases so they cannot be visually discerned at all.
You might notice the camouflaged "trees", but perhaps not the cell sites on top of buildings, looking like elongated loudspeaker boxes.
You'd almost certainly miss the cell sites installed inside chimneys and church steeples, even flagpoles.
Where a base station is installed on top of a building where people live or work, those occupants may be quite unaware that they are in very close proximity to equipment which produces substantial electromagnetic radiation.
http://www.emfnews.org/productinfo.html
http://emfnews.org/Lifewave-Cellphone-Matrix-Shield-Test.html