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All factors that contribute to the interference environment and , ultimately , the ability of users to receive clear radio signals , must be taken into account as early in the process as possible . Microwave Link.A system of communication using high frequency radio signals , exceeding 800 megahertz , for audio , video , and data transmission . I found this island , out in the ocean , mostly using satellites and radio signals , but also by looking at stars with my sextant , the old-fashioned way . If the MN has the capability to receive more than one radio signal , even smoother handover can be realized .