One source describes the radar as having parabolic antennas about 3 foot diameter with separate send and receive antennas.
http://www.secretscotland.org.uk/ind...ecrets/GLRadar
Another shows No3 Mk2 as a trailer mounted set, also 2 antennas, and refers to a separate generator trailer, quoting production as 876 units. I don't know if these are the same type of radar, certainly they are packaged differently. It does give an idea of scale of production.
http://www.anti-aircraft.co.uk/radarNo3Mk2.html
Another forum mentions the GL Mk III C (for Canadian ) as being a 2 part unit one for the antenna and another for control and operator. It is saying 665 sets were made, apparently trailer mounted.
http://www.39-45.org/viewtopic.php?f=61&t=20865
A photo of the trailer mounted set can be found at
http://www.flickr.com/photos/museena...ec/4435376316/ interesting to note that everything above the trailer chassis rotated as a unit, not like more recent radars that only rotate the antenna (and some do the "rotation by electronic adjustment rather than physical movement).
Quoted from a government web site "NRC used the plans to develop the GL Mark III C anti-aircraft radar system. Although it did not see action in Britain, this system was installed in Australia, South Africa, Russia and Canada."
http://www.nrc-cnrc.gc.ca/eng/educat...eries/war.html
Also see MLU thread
http://www.mapleleafup.org/forums/showthread.php?t=3459
A reference exists to an Autralian purchase from Cnada (no mention if what they were mounted on. "In 1943 the Australian Government purchased 86 anti aircraft radar equipments (AA Number 3 Mark 1 (APF) and AA Number 4 Mark 1) from Canada."
http://www.rcsigs.ca/ViewPage/Histor...unting/Page/8/
A Canadian "official" site that provides a different slant than American sites on the relative quality of the 2 nations radar sets. As always, I suspect the truth lies between the two extremes.
http://www.commelec.forces.gc.ca/org...nexe-c-eng.asp
Most of the above came from googling gl +radar mk iii