Microwave antennae on a support tower. These are used to transmit and receive communications data using microwave radiation. Mobile telephones are an example of devices that communicate this way. The signals are relayed through a large network of antennae that are mounted on towers (or masts) like these. The masts are usually around 15 metres high, but larger masts and antennae are needed for more powerful signals over larger distances. These antennae are in Brisbane, Australia.
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