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What are the purposes and advantages/disadvantages
In order to do a depth section you need to have data at multiple depths. The depth is determined by the transmitter-receiver separation. With a single receiver you need to make multiple traverses with different Tx-Rcv separations along your profile line. For example for a four-layer depth section with a single receiver you would need to tow the OhmMapper up the line, then change the separation and tow it back down, then change it again back up, and once again down the line again. That is still much faster than pounding stakes into the ground. With four receivers in the array each receiver measures at a different depth. With a single traverse up the line you have a complete 4-layer depth section. Using multiple receivers makes the survey much more efficient at the cost of a greater initial investment.