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<p>sight on the countryside, as they must rise over trees and other obstacles to ensure clear vision. Older control rooms have often been likened to medieval chambers. The heavy use of stone, iron, and wood in their construction helps to create this illusion. Modern towers frequently have <a href="page.php?w=observation_deck">observation deck</a>s or terraces with restaurants or on the roof of mountain stations of an aerial ropeway. Frequently observation towers are used also as location of radio services within the <a href="page.php?w=Ultra_high_frequency">UHF</a>/<a href="page.php?w=Very_high_frequency">VHF</a></p><p>
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