Transfer function between airborne VLF transmit and receive loop antenna

The US Navy TACAMO aircraft is required to receive very low frequency/low frequency (VLF/LF) signals via a pair of orthogonal H-field loop antennas while simultaneously transmitting a 200 kW VLF signal using a half wavelength dual trailing wire antenna (DTWA). The transfer function is determined from the DTWA current, at a point where it can be measured, to the electromagnetic H-field as sensed by the receive loop antennas. The energy from the collocated VLF transmitter interferes with reception over a large portion of the VL/LF spectrum. The results of the calculations suggest that self-interference can be reduced with simple cancellation techniques