Hi,
I have SATURN at 5230N00715E.
The W-R foundation have no relation to a FF, but all Stellungen had a LFF. The site you have found must be BRILLENSCHLANGE please see:
http://www.gyges.dk/luftwaffe_radar_stations%20in%20France.htm
A FF consisted of two masts with a wire antenna suspended in between and a small hut underneath to house the equipment.
bregds
SES