Taking your radio out for a spin around the pond was popular on both sides of, well, the Pond, as evidenced by this British couple illustrated on the cover of Modern Wireless, June 1924.
For an idea of what they might have been listening to, we can consult the program schedules in the same magazine. Perhaps they were tuned to the Eiffel Tower on 2600 meters. If so, at 10:50 AM, they could listen to the fish prices in the Paris markets at 10:50 AM.
Or, if they stay out until 9:00 PM, at 450 meters, they might be able to tune in an evening concert from the station of the Ecole Supérieure des Postes et Teléraphes.