Editing Anomalous propagation (section)

{{Short description|Radio propagation due to unusual conditions}}
'''Anomalous propagation''' (sometimes shortened to '''anaprop''' or '''anoprop''')<ref>	Peter Meischner (ed.), ''Weather Radar: Principles and Advanced Applications'', Springer Science & Business Media, 2005, {{ISBN|3540003282}} page 144</ref> includes different forms of [[radio propagation]] due to an unusual distribution of temperature and humidity with height in the atmosphere.<ref name=WMO>{{Cite web|url=http://www.eumetcal.org/resources/ukmeteocal/rapid_cyclo/www/english/glossary/anomalou.htm|title=Anomalous propagation|author=World Meteorological Organization|author-link=World Meteorological Organization|publisher=Eumetcal|accessdate=2012-09-10|archive-url=https://web.archive.org/web/20150924014145/http://www.eumetcal.org/resources/ukmeteocal/rapid_cyclo/www/english/glossary/anomalou.htm|archive-date=2015-09-24|url-status=dead}}</ref> While this includes propagation with larger losses than in a standard atmosphere, in practical applications it is most often meant to refer to cases when signal propagates beyond normal radio horizon.

Anomalous propagation can cause interference to VHF and UHF radio communications if distant stations are using the same frequency as local services. Over-the-air analog television broadcasting, for example, may be disrupted by distant stations on the same channel, or experience distortion of transmitted signals [[Ghosting (television)|ghosting)]]. Radar systems may produce inaccurate ranges or bearings to distant targets if the radar "beam" is bent by propagation effects. However, radio hobbyists take advantage of these effects in [[TV and FM DX]].