RB4011 gave me about 5-15 Mbit in either direction.

SXTsq gave me about 30-60 Mbit down but only 0.5 - 5 Mbit up and was generally unstable.

I spent like a full hour yesterday carefully tuning the antenna positions and placement of the RB4011, so now it gives me about 20-40 Mbit in either direction. And I guess I'll live with that for now. It's enough to stream most content from my NAS to my osmc box. But still means I can't stream stuff like 4K Blu-ray rips until I somehow get a better connection.