This document discusses using multi-temporal radar sounding to observe evolving Antarctic ice shelves. The goals are to characterize ice shelf basal conditions over time, such as changes to basal channels and melt rates. Radar methodology allows direct observation of basal features by analyzing surface echo power, englacial attenuation loss, and basal echo power. For example, relating englacial attenuation to ice temperature can estimate ocean-driven basal melt rates. Comparing modern radar data to archival data from the 1970s can reveal historical changes to ice shelves like Ross Ice Shelf thickness before recent warming.