Such a mounting surface 101 is usually vertically positioned in {HEAD ~ the vicinity} of {TAIL ~ a window} or other architectural opening 
of
Such a mounting surface 101 is usually vertically positioned in { HEAD ~ the vicinity } of { TAIL ~ a window } or other architectural opening
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH