People who associate HF FAX with noise and grunge haven't seen what the mode can do under optimum conditions. Here's a 24-hour upper-level forecast chart with only one small fade and the absolute minimum of multipath.
BTW this was received from US Coast Guard, Point Reyes (north of San Francisco) on a small wire antenna surrounded by trees. You don't need a lot of equipment for this mode. The frequency was likely 8682.0 kHz USB, since the 4 MHz frequency has more multipath.
All fax signals are tuned 1.9 kHz lower than their listed frequencies.