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A good quality fully automatic car aerial that is designed to fit negative earth cars and is electrically operated and powered by the car battery. The aerial will only extend when the radiocassette is switched on and is retracted when the radiocassette is off, so greatly reducing the risk of the aerial being damaged by vandals. Power and control connections to the aerial are made by three wires green and red, which have bullet type connectors, and a black wire which has an eyelet connector. The red must be connected to the positive battery supply via a suitable fuse rated at 5A. Green must be connected to the power antenna lead output of the radio cassette, or directly to the onoff switch of the radio cassette. Black is connected to the car chassis or negative battery terminal. The antenna when fully extended is 0middot81m in length, and is supplied with 1middot3m of screened cable which is terminated in a standard car aerial plug. The assembly is 335mm in length with the aerial completely retracted and 22mm in diameter.
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