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A radio telescope is a telescope that is designed to examine the radio portion of the electromagnetic spectrum (http://en.wikipedia.org/wiki/Electromagnetic_spectrum). Because this part of the spectrum has much longer wavelengths than visible light it is focused by much larger less polished reflectors than those used for an optical telescope. Here is a picture of a couple of different sizes (http://en.wikipedia.org/wiki/Image:Parkes.arp.750pix.jpg) and this is a rather unusual one (http://www.naic.edu/public/the_telescope.htm). The second one was actually used for some of the scenes in for the James Bond movie "Golden Eye" and the movies "Contact".
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A radio telescope is a form of directional radio antenna used in radio astronomy and in tracking and collecting data from satellites and space probes. In their astronomical role they differ from optical telescopes in that they operate in the radio frequency portion of the electromagnetic spectrum where they can detect and collect data on radio sources. Radio telescopes are typically large parabolic ("dish") antenna used singularly or in an array. Radio observatories are located far from major centers of population in order to avoid electromagnetic interference (EMI) from radio, TV, radar, and other EMI emitting devices. This is similar to the locating of optical telescopes to avoid light pollution, with the difference being that radio observatories will be placed in valleys to further shield them from EMI as opposed to clear air mountain tops for optical observatories. http://en.wikipedia.org/wiki/Radio_telescope
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It is a combination of radio receiver and antenna, used for observation in radio and radar astronomy. Radio telescopes vary widely, but all have two basic components: a large radio antenna or an antenna array and a radiometer or radio receiver. Because some astronomical radio sources are extremely weak, radio telescopes are usually very large, and only the most sensitive radio receivers are used. The first large fully steerable radio telescope was completed in 1957 at Jodrell Bank, Eng. The world's largest fully steerable radio telescope is the 360 ´ 330-ft (110 ´ 100-m) off-axis antenna operated by the National Radio Astronomy Observatory in Green Bank, W.Va. The largest single radio telescope is the 1,000-ft (305-m) fixed spherical reflector at the Arecibo Observatory in Puerto Rico. The world's most powerful radio telescope is the Very Large Array in New Mexico, made up of 27 separate mobile parabolic antennas that together provide the angular resolution of a single antenna 22 mi (35 km) in diameter. http://content.answers.com/main/content/img/BritannicaConcise/images/3690.jpg
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