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We demonstrate an atomic radio-frequency (RF) receiver and spectrum analyzerbased on thermal Rydberg atoms coupled to a planar microwave waveguide. We usean off-resonant RF heterodyne technique to achieve continuous operation forcarrier frequencies ranging from DC to 20 GHz. The system achieves an intrinsicsensitivity of up to -120(2) dBm/Hz, DC coupling, 4 MHz instantaneousbandwidth, and over 80 dB of linear dynamic range. By connecting through alow-noise preamplifier, we demonstrate high-performance spectrum analysis withpeak sensitivity of better than -145 dBm/Hz. Attaching a standard rabbit-earsantenna, the spectrum analyzer detects weak ambient signals including FM radio,AM radio, Wi-Fi, and Bluetooth. We also demonstrate waveguide-readout of thethermal Rydberg ensemble by non-destructively probing waveguide-atominteractions. The system opens the door for small, room-temperature,ensemble-based Rydberg sensors that surpass the sensitivity, bandwidth, andprecision limitations of standard RF sensors, receivers, and analyzers.

Waveguide-coupled Rydberg spectrum analyzer from 0 to 20 GHz