The Round Card Game of Sparx or Listening In

A game from the early days of radio. There are seven sets of seven cards and you use one set per player per game.
Players call out for cards they need to complete their set (in the manner of Pit) and points are scored depending on the place the set originates from e.g. London. Glasgow, etc..The player has to call out "Tuned In to London" or where ever for his set..
There are two special cards:
Oscillator - which is a penalty card if another player calls "Tuned in to xxx" whilst you hold the card.
K.D.K.A. American Broadcast Station - Can be used as a wild card to replace a proper card. If you can complete a set without the use of this card and you have it in your hand, then you score double points for your set.
The cards are rather nice, showing radio call-signs in those first few years.