In Europe, cell towers are required to be placed no closer than one kilometer from each other. A kilometer equals .62 miles.
Manhattan is 22.82 square miles or 36.75 square kilometers. In 2013, there were 14,000 mobile phone base stations.
Below is the 2007 map of approved antenna permits. Today, knowing what is in my neighborhood, I think that it's safe to say that this number has been actualized.
If this was a European city, we'd have about 37 cell towers. On the map above, there's too many to count.
To add, we now have cell phone kiosks on every corner, up and down Broadway and cell transmitters in the subways.
Here's another Manhattan cell tower map.
Most of us have a cell phone, wifi in the home, cordless phones, bluetooth appliances, Alexa, baby monitors, wireless keyboards and mice, smart meters, and more. Add to this, a power company that doesn't know what a gauss meter is and wiring errors causing high EMF in nearly half of all homes.