Hi Guys,
First, some links:
http://www.cdvandt.org/D-Luft-T-4069-FuG-16ZY.pdf
http://www.radiomuseum.org/r/lorenz_...fug_16_zy.html
And the C.Lorenz A.G/ITT (See Ed West pointer about Anthony Sutton times ago!

) article as reminder:
http://en.wikipedia.org/wiki/C._Lorenz_AG
As described by waroff we can just make the difference between a Dipole Antenna (created by Herz) and a "Morane antenna" which is a 1/4 wave antenna.
I Wonder if the MS406 aerial was a "Y" antenna; I think it wasn't, but why not. One can confirm?
Like JCM - I guess - I think we should read "Morane LIKE antenna" instead of "Morane antenna" since it seems that term does appear - first - only in - dated - English aviation littérature and - by extension - we all are using it.
Good and useful shortcut but nothing else I'm afraid. (And, for example, I don't think I've read this term in LiF articles ...)
Why? Because it's a technical charasteristic for 1/4 wave antennas to be located - at best - perpendiculary to the support. Since we find dipole antennas for radio communications the only place to fit it is ... Under the belly. For maximum efficiency and to avoid radio interférences.
Remember that some
Bf109Fs got one "Y" aerial in place of "normal" radio mast.... without dipole, of course.
Regards, Franck.