Most reliable for HF comms and phone patches was Portishead, followed later on by Stockholm radio.
When our cutting-edge Artichoke couldn't hear us/speak to us, we'd call Portishead who asked roughly whereabouts in the world we were - turn their aerial array and Bob's your Dad's brother it worked . . .
It was also fun listening to Chaz Fink talking on the CB channels . . . (which of course NEVER happened).