More info here: “It has a flat fan-shaped radiation pattern, which is tilted slightly down to cover the cell area without radiating at higher angles into further off cells which reuse the same frequencies. The elevation angle of the antenna must be carefully adjusted, so the beam covers the entire cell without radiating too far.”

https://en.wikipedia.org/wiki/Cell_site

Also some antenna radiation patterns here, not sure how accurate: https://www.slideshare.net/nehakumar01/radiation-pattern-of-...