The discone is a popular wideband antenna for VHF and UHF. This article shows you how to build a very efficient one for your UHF scanner.
The Discone Antenna described here was designed to operate over a frequency range of 700 to 2000 MHz. It is a very small antenna, but very effective. It is vertically polarized. and has an omni-directional radiation pattern.
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, Added: Mar 8, 2004
http://krasnodar.online.ru/hamradio/ftp/discone.pdf