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Sensors based on spin qubits in 2D crystals offer the prospect of nanoscalesensing volumes, where the close proximity of the sensor and source couldprovide access to otherwise inaccessible signals. For AC magnetometry, thesensitivity and frequency range is typically limited by the noise spectrum,which determines the qubit coherence time. This poses a problem for III-Vmaterials, as the non-zero spin of the host nuclei introduces a considerablesource of magnetic noise. Here, we overcome this with a sensing protocol basedon phase modulated continuous concatenated dynamic decoupling, which extendsthe coherence time towards the $T_1$ limit at room temperature and enablestuneable narrowband AC magnetometry. We demonstrate the protocol with anensemble of negatively charged boron vacancies in hexagonal boron nitride,detecting in-plane AC fields within $\pm 150~\mathrm{MHz}$ of the electron spinresonance, and out-of-plane fields in the range of $\sim10-150~\mathrm{MHz}$.We measure an AC magnetic field sensitivity of $\sim1~\mathrm{\mu T/\sqrt{Hz}}$at $\sim2.5~\mathrm{GHz}$, for a sensor volume of $\sim0.1~\mathrm{\mu m^3}$,and demonstrate that the sensor can reconstruct the AC magnetic field from awire loop antenna. This work establishes the viability of spin defects in 2Dmaterials for high frequency magnetometry, demonstrating sensitivities that arecomparable to nitrogen vacancy centres in diamond for microscopic sensingvolumes, and with wide-ranging applications across science and technology.

High Frequency Magnetometry with an Ensemble of Spin Qubits in Hexagonal Boron Nitride