Why are helis not visible on radar for aircraft

Warthunder radar mechanics are funny…its most based off of speed making heli basically invisible even while they should have a big enough rcs to provide a return on radar even for aesa radars.What happens to the returns the rcs should provide when the pd filter is not at play.You can see a small missile from 80 plus km away but not a heli 10kms away from you because of the pd logic on radars.
What would be the point of adding stealth planes then if radars in the game can just see fast and not based off rcs

Because the rotor blades, aren’t modeled to emit returns when they should.

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Because we do not have the ability to toggle the notch filter in game. It is locked on when “looking down” with the radar. So you must use pulse/lprf mode.