Big aerials and speakers enable the passengers of a car to listen to the wireless whilst travelling.
Item title reads - Another wireless wonder. You can now listen in whilst making holiday motor tour. London.
A bus and car drive down the road, the car has a number of aerials and a big speaker attached to it. M/S of the big radio speaker and aerials, a man with headphones sits in the car. Not exactly subtle and unobtrusive!
Note: there is a duplicate copy of this story on *PM0440* - check for best quality - EB 2001.