Editing Directional antenna (section)

== Gallery ==
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Image:BambergersWOR1922.jpg|An early example (1922) of a directional AM radio transmitter using a [[random wire antenna|long wire antenna]], built for [[WOR (AM)|WOR]], then in Newark, New Jersey and targeting both New York City and Philadelphia in addition to Newark.

File:JanskyatAntenna hi.tif|[[Karl Jansky]] and his rotating directional radio antenna (1932) in [[Holmdel, New Jersey]], which was the world's first radio telescope, discovering radio emissions from the [[Milky Way]].

File:Grote Antenna Wheaton.gif|[[Grote Reber]]'s homemade antenna in [[Wheaton, Illinois]] (1937), world's second radio telescope and [[Reber Radio Telescope|first parabolic radio telescope]] 

Image:Horn Antenna-in Holmdel, New Jersey - restoration1.jpg|[[Holmdel Horn Antenna]] in [[Holmdel, New Jersey]] (1960s). Built to support the [[Echo satellite]] communication program,<ref>{{cite journal |author1=Crawford, A.B. |author2=Hogg, D.C. |author3=Hunt, L.E. |date=July 1961 |title=Project ''Echo'': A horn-reflector antenna for space communication |journal=[[The Bell System Technical Journal]] |pages=1095–1099 |doi=10.1002/j.1538-7305.1961.tb01639.x }}</ref> it was later used in experiments that revealed the [[Cosmic microwave background]] permeating the universe.<ref>{{cite web |title=Horn antenna |date=2001-11-05 |department=Astronomy and astrophysics |series=History |publisher=U.S. [[National Park Service]] |url=http://www.nps.gov/history/history/online_books/butowsky5/astro4k.htm |access-date=2008-05-23 |url-status=dead |archive-url=https://web.archive.org/web/20080512093810/http://www.nps.gov/history/history/online_books/butowsky5/astro4k.htm |archive-date=2008-05-12 }}</ref>

Image:Goldstone DSN antenna.jpg|[[Parabolic antenna]] – the 70&nbsp;m antenna at [[Goldstone Deep Space Communications Complex]] in the Mojave Desert, [[California]]

Image:Voyager_Spacecraft_During_Vibration_Testing_-_GPN-2003-000008.jpg|[[Voyager 2]] spacecraft. The HGA (a parabolic antenna) is the large bowl-shaped object.

Image:PAVE PAWS Radar Clear AFS Alaska.jpg|A giant [[phased-array]] radar in Alaska

Image:Montreal-tower-top.thumb2.jpg|A [[Yagi-Uda antenna]]. From left to right, the elements mounted on the boom are called the reflector, driven element, and director. The reflector is easily identified as being a bit longer (5% or more) than all the other elements, and the director(s) a bit shorter (5% or more).

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