  Over the last 25 years, radiowave detection of neutrino-generated signals,
using cold polar ice as the neutrino target, has emerged as perhaps the most
promising technique for detection of extragalactic ultra-high energy neutrinos
(corresponding to neutrino energies in excess of 0.01 Joules, or $10^{17}$
electron volts). During the summer of 2021 and in tandem with the initial
deployment of the Radio Neutrino Observatory in Greenland (RNO-G), we conducted
radioglaciological measurements at Summit Station, Greenland to refine our
understanding of the ice target. We report the result of one such measurement,
the radio-frequency electric field attenuation length $L_\alpha$. We find an
approximately linear dependence of $L_\alpha$ on frequency with the best fit of
the average field attenuation for the upper 1500 m of ice: $\langle L_\alpha
\rangle = \big( (1154 \pm 121) - (0.81 \pm 0.14) (\nu/$MHz$)\big)$ m for
frequencies $\nu \in [145 - 350]$ MHz.
