5745081HF antenna for a helicopter1998-04-28Brown et al. 5621421Antenna and mounting device and system1997-04-15Kolz et al. 5289198Double-folded monopole1994-02-22Alshuler 4426649Folded back doublet antenna for very high frequencies and networks of such doublets1984-01-17Dubost et al.343/700...