This is a highly integrated three port assembly, combining an OMT with a transmit reject filter and elbow. It is small, lightweight, easy to install and is aesthetically appealing. The OMT is designed for linear orthogonal polarization. The combined OMT and filter assembly provides very high isolation and is suitable for a large variety of applications in VSAT ground terminals. The unit has a WC 75 flange at the feedhorn port, a WR 75 with a grooved surface at the transmitter port and a WR 75 flange with a flat surface at the LNB receiver port. An adaptor can be provided to allow the transmitter port to match with a transmitter with a grooved surface.