Isotron is the trade name for a shortwave antenna marketed by Bilal Co. for use as an amateur radio transmitting antenna for restricted spaces.Ralph Bilal, Bilal Company website, 2011, Florissant, Colorado, backup It is physically short as compared to a dipole antenna for a given frequency. The bandwidth of the Isotron is quite narrow as compared with a dipole antenna. This is most pronounced on the lower frequency bands.

Theory of operation A Isotron antenna is electrically resonant by using only two components: a large coil in series with the capacitive plates. Its design is electrically the same of a 1/2 wave dipole., backup

See also Antenna (radio) Dipole

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