Is it 28540KH?
From this site in Washington there's nothing - http://na5b.com:8901/
A site in France seemed to have nothing.
How close does it have to be?
[edit] I will say WebSDR is fucking cool. Closest I can see is http://94.137.189.166:8901/ Tbilisi - Georgia 500 miles away but doesn't have anything, unless I'm using this wrong.
here's a complete session to check my winlink mail: https://www.youtube.com/watch?v=DA6JRB560eM the actual transmission starts about a minute in, the first minute is my station waiting its turn
Fortunately, the 10m band these days has a reach of up to 11000km due to the solar activity. You are quite right that during LOS conditions it’s limited to the elevation of the antenna.
Its relatively small antenna needed (5m dipole) and can be used to access some distances, just not ones that might be in the same country as origin because of the skip dead zone from the ionospheric refraction angle. Which depending how it might be used, could be useful.
The general rule of thumb is to check the MUF Rating at the time of day collected from ionosondes such as that on https://prop.kc2g.com/