We are using NanoStation M2 units here, Ch -2, 10 MHz BW. When two nodes are a mile apart with a fair amount of obstacles, I'm achieving 100% LQ, 100% NLQ and around 20-30 TxMbps which seems reasonable. However, when I take another NSM2 to a mountain top with line of sight and 7 miles apart, same settings, I'm getting 100% LQ, 100% NLQ, but 0.0 TxMbps. I'm able to connect fine, but the link is quite a bit slower than the one mile link. It's still a single hop because I cannot see any other neighbors from the mountain top.