Anther follow-up in case someone stumbles upon this in the future and wants more information. The 800km limit applies to quite a few countries. Many of them (b

Anther follow-up in case someone stumbles upon this in the future and wants more information. The 800km limit applies to quite a few countries. Many of them (but not all) were members of Soviet Union. You can find a list here: https://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf10759.html https://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf10759.html (search for "800 km".) It looks like these come from the ITU table of frequency allocations so there's likely some history behind the 800km limit. I haven't found any great information yet, but will add it if I do.