This paper presents development results of a generic pick-up horn (GPUH) for high power thermal vacuum (TVAC) test of satellite communications payloads. The GPUH is an improved method than the PUH that was presented earlier. It has much wider bandwidth of more than three octaves covering X-band, Ku-band, and Ka-band, can handle more power than the PUH, has better return loss, and is insensitive to polarization. Design and measured results of the GPUH are given here and are also discussed in an earlier publication.