After half a century of rapid AEM (airborne EM) development and application, the 1980s were a “decade of uncertainty” (Fountain 1998) in which improvements focused mainly on increased bandwidth, multiple coil systems, and other advantages attendant on improved electronics and signal processing. An exception was the University of California Berkeley UNICOIL cryogenic helicopter system which adopted a single coil as both transmitter and receiver. Morrison et al. (1998) showed that this array maximized the ratio of target-to-host response in conductive environments. UNICOIL development was suspended in the early 1990s, but the same principle was used by AeroQuest in the AeroTEM...

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