Complex sentence: Current circulating in one antenna generally induces a voltage across the feedpoint of nearby antennas or antenna elements; note that this now is a near field phenomenon which is not properly accounted for using the Friis transmission equation for instance.
Split into simpler sentences: Current circulating in one antenna generally induces a voltage across the feedpoint of nearby antennas or antenna elements. Note that this now is a near field phenomenon which could not be properly accounted for using the Friis transmission equation for instance.