Receiver Testing Range
![Receiver Testing Range](https://public.nrao.edu/wp-content/uploads/2013/06/gallery-images-largeDSCN8761_large.jpg)
These towers in Green Bank are used to test new and serviced receivers. The tower with the small dish sends a signal, and the antenna across from it collects the waves and funnels the signal down onto the test receiver.
Credit: NRAO/AUI/NSF
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