The PRC-14...
PRC-14, with canvas and helmet mounted antenna...was intended to give the groundpounders a way to talk directly to aircraft using the new UHF AM band.  In the late forties, U.S. military aviation began a migration from the shared VHF AM band of 100-156 MCs to the strictly military UHF AM band of 225-400 MCs.  This little critter was one of the military's first attempts to get a portable radio to work in that UHF AM band.  The set wasn't intended to be operated in the canvas -  it was instead strapped onto the lucky grunt with the power supply on his back and the transceiver on his chest.  The antenna was tightly clamped onto the steel helmet -  the radiation pattern modeling of a 1/4 wave vertical atop a GI helmet is left as an exercise for the reader...

  The PRC-14 is
 
 
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