Purchased for the exact same reason, problem with DAB is it tends to either work or not, I would try
and borrow a similar radio and try it in his room or see if anyone else is using one. If there is a TV
antenna connection in the room you maybe be able to plug that into the radio.
The radios themselves seem to be good quality though depending on his eye sight and technical ability
he might have problems using it, if he has dementia for instance I would go for a simple to use radio.
Hope this helps.