Ferrite Rod, 100mm long, 3/8 inch Diameter

100mm long,
            3/8" diameter Ferrite Rod

MW tuning and coupling coils on ferrite
            rodtuned antenna coil with output coil

Ferrite is a ceramic material with a high iron content.  It has high magnetic permeability but low electrical conductivity compared to iron metal.
  In the schematic symbol the pins labelled 3 and 4 are the large main tuning coil and the pins labelled 5 and 6 are the smaller output coupling coil shown at the top in the picture.  Pins 1 and 2 and the associated winding are not present on our coil.  In a different design, an extra winding like that could be used at the bottom end of the rod to connect to an external aerial and earth.

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