[Milsurplus] tank radio skip?

[Hue Miller]

"Les Materiels Radio de la Wehrmacht 1935 - 1945"  Pierre Metsu ( F6HEB ), Heimdal (press)
(France) 2004. Costs about $40. Probably worth it despite usual page and caption
screw-ups.

Lists several LF/MF sets using frame antenna OR 24 ft mast OR Star Antenna  ( about 7 ft
capactive hat mast ). You can understand how the frame antenna would be handier when
travelling. I DO see one HF set to 7 MHz which specifies "Roof antenna"  ( = frame
antenna ) but most of the configs that used this setup were LF/MF thru 3 MHz only.
Also pg. 201 shows scout car Sd.Kfz. 250 ( Special Motor vehicle type 250 ) "Equiped
with an early version frame antenna", then another photo showing same vehicle, "late
version" with vertical rod antennas. QUESTION:  IF this unique antenna was especially an 
NVIS device, why did the Wehrmacht abandon such a good thing?  
This book shows a DF receiver, the model EP2 which tuned up to 3 MHz, with loop antenna
on top receiver, kinda like our PRD-1 another setup of same receiver in truck, with loops atop
truck. Also a receiver FuPEC1 1.5 - 25 MHz, which required a field setup with a hut or tent
surrounded by 6 mast antennas about 20 ft tall. Looks like they were spaced about 10 -
15 ft apart.  -Hue Miller