There is a ReSound user who is a resident M.D., has profound hearing loss, and has gotten remote microphones designed to work with HA’s. For him at his relatively young age, hearing well is important enough that he has almost spared no expense. He has FOUR Phonak Roger Pens that he hangs on different individuals in the OR. The input from the mics is broadcast to a Roger Receiver plugged into his ReSound Multi-Mic, I believe. The ReSound Multi-Mic thus streams the sound to his HA’s and he says it works great.
The thing about the Roger Pen/Receiver combination is that amongst the four mics, the active input is automatically switched to the person speaking. The ReSound Multi-Mics, according to the good Dr., cannot do this, but he still needs the Multi-Mic as a transducer in the pathway to relay the sound of speech to the ReSound Quattro’s he wears. This is a very expensive solution as Phonak accessories at retail prices are VERY EXPENSIVE, something like ~$700 per Roger pen, not to mention the receiver. I vaguely gather that Roger Receivers come with different inherent gain capabilities so you might need a specific Roger Receiver model tuned to the gain that your Dad needs for his HA’s if you went this route. Folks who have done this try to buy the equipment needed more cheaply on eBay but you could have warranty problems there, depending on exactly what you are sold.
@efigalaxie is an expert on all this stuff but unfortunately we haven’t heard too much from him lately. Besides focusandearnit, efigalaxie would be a great source of information if he has the time to provide the info.