

Could you mount the antennas, or even just one of them, externally? That may improve performance. A small parabolic antenna a few inches wide or a purpose made building to building bridging kit only needs a small mounting surface with a few screws, and as for the wire you might not need to drill a hole, though properly patched that’s not a big deal either, but instead use an existing hole by removing old, unused phone or cable wire.
Alternatively, is there a window facing in the correct direction? Signals penetrate glass way better than all of the siding, insulation, drywall, etc in an external wall. Remember there’s way more material than an internal wall to penetrate. And if you have aluminum or other metal siding, cement block or brick, or certain kinds of insulation, it may not work at all. The tree branches may or may not be an issue depending on how thick they are, if they are branches with lots of leaves, the types of leaves, the density of the wood, etc. But the exterior wall penetration means it’s literally not line of site (you can’t visually see from one antenna to the other), so the rated ranges are moot and may or may not work reliably.


X11 is way, way older than that. But it also was more actively developed for most of that time.