Faraday rotation observations are unique amongst radio occultation measurements in that they respond to magnetic field in addition to electron density, making it possible to probe the coronal magnetic field. Signatures interpreted as transients in Faraday rotation measurements made by Pioneer 6 in 1968 in the heliocentric distance range of 6--11 R0 are shown to be caused by coronal streamer stalks of angular size 1--2¿ observed in white-light measurements rather than the magnetic bottles interpreted earlier. This identification makes available the first magnetic field observations of coronal streamers. The detection of the reversal of magnetic field polarity high in the corona provides observational evidence confirming what has previously only been inferred from modeling-that streamers observed in white-light measurements are the manifestation of the heliospheric current sheet. These results reinforce the apparent connection between the coronal streamer stalk observed in white-light coronagraphs and the heliospheric plasma sheet identified by in situ fields and particles measurements beyond 0.3 AU.¿ 1997 American Geophysical Union