Notching definitely works, it is used routinely in air combat. It is more effective at greater range because it's hard to maintain the same distance to a radar

Notching definitely works, it is used routinely in air combat. It is more effective at greater range because it's hard to maintain the same distance to a radar that is closing on you. The principal use is to break missile lock. It's less useful for disguising position, especially against opponents with AEW&C and data link. Breaking lock means reducing the doppler return to below the range gate threshold, and changing bearing to escape the Kalman filter that is predicting your position based on prior kinematics.