Motorola has a book called "Standards and Guidelines for Communication Sites" [
Motorola_R56_2005_manual], 518 pages of communication goodness.

• https://sites.auburn.edu/admin/facilities/spw-bid-calendar/11-150%20AU%20Regional%20Airport-Construct%20a%20Self-Supporting%20Radio%20Tower/Project%20Documents/1/Motorola_R56_2005_manual.pdf