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Small phased array radar is going to bring down thunder and fire on you. If you're spewing out EM emissions on the front lines of a modern battlefield you're going to be in trouble. Better off with electro-optical or infra-red, something passive.
What if they come in like a flock, 5 or 10 or 20 from multiple angles to overwhelm the turret? I've seen videos of that happening against even these up-armoured, orky looking vehicles. They achieve mission-kill eventually, then the crew have to flee because they're stuck. Then they die. 5 or 10 or 20 FPV drones won't cost that much compared to the minigun CIWS integration, especially if AI guided. And the drones kill not just the CIWS but the vehicle as well.
LPI radar exists, but if drones are the specific concern you could just listen acoustically (or IR) to only turn it on when it's actually necessary to emit. Drones are loud.
Lidar (leveraging self-driving car sensors) might also be worth considering, but could still be prone to detection.
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For now, you could go with 80 GHz automotive radars. Extremely short range, most current military radar equipment won't detect those ultra high frequencies, and it always could just be a newer Mercedes on adaptive cruise control.
Also, the sensors are cheap (because automotive sensors are a cut-throat business) completely integrated packages (even the phased antenna array needs to be directly on-chip), and at that frequency it's trivial to not only detect the quadcopter, you detect every single moving blade of its propellers, and the rounds you're shooting at it.
The bigger issue is also just that if your countermeasure is close range CIWS you're not in a great spot to begin with. That's deep in the survivability onion.
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