Generally, the precision of microwave measurements is limited by the natural linewidth of the employed spectroscopic features. To overcome this constraint, we exploit collective radiative effects in many-body atomic ensembles as a means of linewidth engineering. We introduce a measurement strategy in which superradiance gives rise to an ultranarrow transmission feature that can be directly accessed via spectroscopic readout, with a linewidth scaling as $f/\mathrm{\Gamma }\propto 1/N$. Additionally, we establish that an incoherent pumping scheme can prepare a stable subradiant state. This state offers an alternative pathway for enhancing sensitivity, which originates from its intrinsically narrow linewidth. Our proposal can be readily implemented on various platforms, such as Rydberg atoms, quantum dots, and waveguide materials, offering an approach to achieving quantum-enhanced measurement precision.

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• Coherent control
• Collective effects in atomic physics
• Superradiance & subradiance
• Atomic ensemble
• Semiclassical methods