To send a fax you need access to a handhshaked landline. A direct wire between the stations. Faxes synchronize themselves, send data and test the bit, makeing sure it is properlt placed in the data queue, and send the next and so on =handshake. Suggest you look up old fax synchronization and I tossed my last muirhead rotary in 1982 - used it for weather maps.https://electronics.howstuffworks.com/gadgets/fax/history-of...

Newspapers have used it since the 1800's in one for or another. Wire-Photo https://antique-photos.com/en/helpful-info/476-wire-photos.h... This is a relic of the old Muirhead rotary scanning fax machines abd the same standard persists. This is hard to do via radio. So radios send a pdf to a fax service. I have a fax service for $10 a month, I send it via desktop or mobile, and receive the same way as a pdf. With a mobile printer or office printer you get hard copy. https://www.myfax.com/features