Isotron
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Isotron is the trade name for a shortwave antenna marketed by Bilal Co. for use as an amateur radio transmitting antenna for restricted spaces.[1] 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.Script error: No such module "Unsubst". The bandwidth of the Isotron is quite narrow as compared with a dipole antenna. This is most pronounced on the lower frequency bands.