name that connector?

[Rodzilla]

the fm antenna connection on my nordmende and on other german radios i've seen connects to what looks like a miniature dual banana plug on the built in antenna...the connections to the radio itself for both am and fm are small square holes...with the idea of hooking up some external antenna to this radio i've been trying to find out what it is i need to use for this...and not only can i find no ready made connectors but honestly no reference to just what type of connector this even is..does it have a name?it seems not to be something one can buy...but that being the case what type of pin connector is typically used for these?anyone run into this and have any advice on what works?