work performed by telecom crews

Most firms require that a telecom tower crew foreman has between three and four years of tower climbing experience and previous experience of managing a team of two to five people working on a telecom tower.

A telecom tower crew foreman must also have a range of other skills. These may include experience with colocation and civil wireless construction. General requirements include customer-facing expertise, ability to work independently, and ability to use power tools.
More info: https://www.fieldengineer.com/skills/telecom-tower-crew-foreman-ericson