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Recent advances in Rydberg atom electrometry detail promising applications inradio frequency (RF) communications. Presently, most applications use carrierfrequencies greater than 1~GHz where resonant Autler-Townes splitting providesthe highest sensitivity. This letter documents a series of experiments withRydberg atomic sensors to collect and process waveforms from the automatedidentification system (AIS) used in maritime navigation in the Very HighFrequency (VHF) band. Detection in this band is difficult with conventionalresonant Autler-Townes based Rydberg sensing and requires a new approach. Weshow the results from a new method called High Angular Momentum MatchingExcited Raman (HAMMER), which enhances low frequency detection and exhibitssuperior sensitivity compared to the traditional AC Stark effect. Frommeasurements of electromagnetically induced transparency (EIT) in rubidium andcesium vapor cells, we show the relationship between incident electric fieldstrength and observed signal-to-noise ratio and find that the sensitivity ofthe HAMMER scheme in rubidium achieved an equivalent single VHF tonesensitivity of $\mathrm{100~\mu V/m/\sqrt{Hz}}$. With these results, weestimate the usable range of the atomic vapor cell antenna for AIS waveformsgiven current technology and detection techniques.

High angular momentum coupling for enhanced Rydberg-atom sensing in the VHF band