Recently one of our customer in Central America, deployed a single hop link over 115 km using single channel. Channel size was 20 MHz and the throughput was 30 Mbps which is increbile and enough to cover VOIP calls, Video streaming and other applications. For more information , here is link to PTP 550
https://www.cambiumnetworks.com/products/backhaul/ptp-550/
Thanks
Sagar