So what is the building that is supposed to deal with paratroopers?

[JMoney]

They have about 3k ~ 5k hp, spawn in 3s, and don't make unit spawning buildings spawn units. I don't think any building other than anti-tank towers or the random landmine traps actually deals with them well enough as far as my own usage of them on the british account and against them on the defense side (it's usually a roll because it's all british players using them as damage sponges/tank replacements). A single one of them quite literally has more hp than an APC. Those paratroopers must be cyborgs or something, lol.

 

[Gargantuar]

Add HT spawning bunkers to that list of buildings. Field howitzer in TC can help a bit. Factory (with lib research to spawn HT on destruction). Ofc paratroopers dont spawn them, but if they were spawned by some other troops , then they kill paratroops fast.

Needless to say , but AA Sams do quite well against the paratrooper plane . AA air defenses are also powerful. Spreading them all over the base will much discourage the transport plane attacker.

I have seen some brit attackers who lost their transport plane early on my base, and their attack faltered mid way. Its the fully upgraded fighters that gimme trouble.