Who puts up cell towers?

Factual Questions
1

I was wondering if there are big names subcontractors that put up most of the communications towers (i.e., cellular, microwave, and other RF) for the big names like Verizon, AT&t, the TV networks, etc. If so, how can I find their names? I bet these big communications corps use the same subcontractors repeatedly, but who are they?

2

Here’s a couple:
SBA
Crown Castle

(You can use this site to find towers, then click through to the maps and you’ll eventually find the company names. This shows tower ownership, but many of these companies own towers as well as constructing new ones.)

3

American Tower is another company that deals with putting up & maintaining cell towers.

4

Thanks, y’all!