A towable transient electromagnetic survey device for connection to a land, water based or an airborne towing vehicle is provided. The towable transient electromagnetic survey device includes a central body structure and a number of booms extending therefrom to interconnect the central body structure to the towing vehicle and suspend a transmitter loop for generating a primary electromagnetic field. Receiving loop(s) and transmitter loop(s) may also be housed in the central body structure. The central body structure may also be configured for switching in and out of connection of various transmitter and receiver loop configurations. In particularly preferred arrangements, the location of a transmitter loop or a pair of transmitter loops relative to a receiver loop is effective for substantially nulling mutual inductance between the transmitter loop(s) and the receiver loop.