@zabow @neauoire @cathos I get pretty good results with just a simple HF receiver (Sony ICF-SW7600GR) and the "HF Weather Fax" app on my Android phone.
I received this image an hour ago by just putting my phone next to the speaker of the receiver, so I didn't even use a cable to connect. Also, the receiver was placed indoors in our living room in a city - no additional outdoor antenna.