Also important to remember-
Each tower usually has 3 antennas.
Each antenna is fed by a dedicated coax cable, also known as heliax or transmission line.
A bullet through said coax will often cause intermittent degradation or failure, making the trouble harder to find.
The nature of the damage (a small rupture in a long transmission line) also makes it harder to find.
To minimize RF energy loss, no repairs to heliaz is permitted. The entire run will need to be replaced. Lots of expense and time and labor.