The penetration of telecommunication infrastructure in Indonesia is growing significantly every year. However, this growth is not comparable to the technology distribution in remote areas, especially areas with mountainous contours. So it takes a proper backhaul network design to deploy telecommunication services in remote areas. Microwave transmission technology is widely used as a backhaul network in mountainous areas. However, multipath fading becomes a problem in microwave communication, so we use the diversity configuration approach to solve it. Space diversity configurations are the system most often used, but in more extreme conditions it can use a hybrid diversity configuration, a combination of space and frequency diversity. In this study, we design and compare the performance of two types of diversity configurations, namely space and hybrid diversity in crossmountainous areas using simulation software Pathloss 5.0. Before comparison, these paths are tested with a point-to-point configuration to assess the communication performance using a microwave link. Based on the simulation, the resulting crossmountain microwave communication performance using point-to-point configuration results in 99.98179% availability and 5742.79 seconds unavailability in one year. These values are still far from the ITU-T G.821 standard, namely 99.99% availability. In the configuration using Space Diversity, the quality has increased. Still, it cannot meet ITU standards because it can only produce 99.98333% to 99.98943% availability or comparable to un-availability for 5255.53 to 3332.48 seconds/year. Meanwhile, the hybrid diversity configuration can produce a performance that meets ITU standards with availability of 99.99122% or equivalent to un-availability for 2769.79 seconds per year.