As part of ONR's Integrated Topside (InTop) Program, in 2014 Northrop Grumman delivered a bi-static, active, electronic scanned array (AESA) system, capable of multifunction, simultaneous transmit and receive operation. The system is wide band, transmits high power and has high receive sensitivity. Further, there are simultaneous transmit and receive modes required, in which the transmit AESA radiates signal and noise, which can impact receive sensitivity. Consequently, isolation between the transmitting and receiving subsystems must be sufficiently large to suppress any signal or noise arriving from the transmit AESA at the receiver. We performed accurate modeling of the transmit chain, the transmit-to-receive isolation and the receive chain to predict the receiver sensitivity in the presence of transmitted noise.