The finishing touches for my US Parachute regiment are the radio operators. Typically like many sets of plastic figures there were none in the various US Para sets so I had to convert some.
The radio is basically a rectangle of thick plasticard framed by thin microstrip. The aerial is fine copper wire so it will flex without breaking. Finally a rolled cover made of greenstuff was added round the top and sides and additionally served to hide the gaps.
Not visible is a length of rod drilled through the radio and into the figure to ensure it stays in place. The dials, etc are a simple paint job.