Whats it take to destroy FW ship casters?

How many ships, what ships, and is there a reinforcement timer?

bumps

“…shipcaster complexes are invulnerable, these shipcaster beacons can be attacked and destroyed by opposing factions…”

Source: Interstellar Shipcaster Live Now | EVE Online

Shipcaster is an entry point, and beacons are the exits. Shipcasters cycle through all the available beacons (3 max). The active beacon exit system is displayed over the Shipcaster.