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In the above configuration, two radios share a single antenna, which is equipped with two feeds, one for each ODU. Each radio operates at a separate frequency, providing a measure of redundancy inasmuch as a failure in one radio would have no effect on the other.
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Combining radios into a single antenna has the obvious benefit of minimizing roof space requirements as well as aesthetic impact. There is no material risk in sharing a common antenna due to the fact that the antenna is a passive component (metal shroud, fiberglass cover "radome" and brass feed), which should only fail upon physical damage.
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