full opp rudder, lightning mate et al,
I've been doing radio on aircraft for >30 years and a ham operator for just as long and the term "dead space"
was new to me too!
Reminds me of some of the plainly stupid questions and terminology the DCA, DOTATG, CAA, CASA (whatever they were then) would throw at you doing the radio basics and specifics.
English was one of my better subjects at school and at times the exams appeared to have been written by a moron.
20 metres is one hell of a band for skip.