Progress in aircraft aerials

Aircraft aerials must satisfy severe environmental and aerodynamic conditions, besides meeting particular electrical requirements. These conditions are discussed in the paper, and solutions shown to some of the problems. In particular, aerials for h.f. and v.h.f. communication and v.h.f. navigation systems are described. Problems associated with aerial systems for automatic landing equipments are discussed, and a number of solutions are proposed. At this stage, virtually the beginning of multiple systems, it is improbable that the solutions proposed will be final. The basic problems of v.h.f. aerial siting have not been discussed fully, but references are given to other papers on this aspect of the subject. No attempt has been made to describe aerials for l.f. navigation aids, or centimetric aerial systems whose requirements can generally be considered apart from the aircraft.