Isotron

{{For|the device for uranium isotope separation|Robert R. Wilson#Manhattan project}}

Isotron is the trade name for a shortwave antenna marketed by Bilal Co. for use as an amateur radio transmitting antenna for restricted spaces.[http://www.isotronantennas.com/ Ralph Bilal, Bilal Company website, 2011, Florissant, Colorado] It is physically short as compared to a dipole antenna for a given frequency. It consists of a coil placed between two angled sheet metal plates.{{citation needed|date=June 2013}} The bandwidth of the Isotron is quite narrow as compared with a dipole antenna. This is most pronounced on the lower frequency bands.