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We report on the fabrication and room temperature measurements of a high frequency electrical signal detector. The device is based on the ballistic transport in graphene to detect a high frequency signal. The observed response is linear in the considered power range (-40 dBm–0 dBm) and exhibits a sensitivity as high as 10 V/W. Finally, the device detected signals up to 50 GHz with a maximum response at 10 GHz. This device outperforms any previously reported carbon based detectors in frequency response and compares to current state of the art Schottky based detectors in dynamic range.