IMHO, it’s important for the defenses to be as cheap or cheaper than the incoming drone/missile. In other words, for some types of enemy drones, it may be best to go back to a flak style defense.
Flashback 2019:
Saudi oil production cut by 50% after drones attack crude facilities
Saudi Arabia shut down half its oil production Saturday after a series of drone strikes hit the world’s largest oil processing facility in an attack claimed by Yemen’s Houthi rebels.
How about a big tin building? Drones are light and have zero penetration ability.
I’ll call the idea “a hangar”.
That means going back to nuclear deterrence. Sure you can take out our base, cheaply. Go ahead. My nuke is a whole lot cheaper than your Capital city.