The firefly used the no. 19 wireless set, which had two radios in it, thus it had two antennea.
British antenna was made up of 48" sections screwed together. Typically, one antenna on the Firefly was 48" long and the other was 96". In 1/35 scale, that would be about 35 mm and 70 mm respectively.
Chuck Rothman
AMPS Webmaster
www.amps-armor.org