Power, batteries and protection a telecom tower site needs before it carries traffic.
A lithium battery is valuable enough to steal. The SARBS rack hides the locks and braces the door so the string stays in the compound.
A tower is on air only when the DC plant, the battery, the cabinet and the earth path are all finished. Here is the order SARBS sites actually follow.
Antennas get the photograph. The pad, the fence, the power trench and the acceptance test are what make a tower site real.