In our ham-language, it is another word for 2-wire-feeder. Originally, this system has been invented long time ago by Professor Lecher from Austria, and for this reason it is called sometimes the Lecherline too. our french friends are calling it "echeles a grenouilles", which means "frog-ladder" and we in DL are saying "Hühnerleiter", which is the same as "chicken-ladder". But the word "ladder-line" is describing it correctly in the same way!