  We report an in situ measurement of the electric field attenuation length at
radio frequencies for the bulk ice at Summit Station, Greenland, made by
broadcasting radio-frequency signals vertically through the ice and measuring
the relative power in the return ground bounce signal. We find the
depth-averaged field attenuation length to be 947 +92/-85 meters at 75 MHz.
While this measurement has clear radioglaciological applications, the radio
clarity of the ice also has implications for the detection of ultra-high energy
(UHE) astrophysical particles via their radio emission in dielectric media such
as ice. Assuming a reliable extrapolation to higher frequencies, the measured
attenuation length at Summit Station is comparable to previously measured
radio-frequency attenuation lengths at candidate particle detector sites around
the world, and strengthens the case for Summit Station as a promising northern
site for UHE neutrino detection.
