I would like to know please whether or not I can pick up alien radio signals from my backyard.
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1$\begingroup$ Sure, you can try. My recommendation is to buy this amateur radio telescope (primalucelab.com/radioastronomy/…) between several people. Also, you can directly help scientists find extraterrestial intelligence without the need of any telescope; here how to do it: youtube.com/channel/UCdDS4j318UpKjNcpe_LeQxQ $\endgroup$– The Exoplanets ChannelOct 1, 2017 at 0:36
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$\begingroup$ In addition to the fine answer/comment above. After some 40 years of listening (not sure when the big ear was built), No nation on the Earth has found a definitive alien signal. If they are out there, they're hard to find. $\endgroup$– userLTKOct 1, 2017 at 8:05
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2$\begingroup$ @userLTK - You’re talking about undocumented aliens??? /s $\endgroup$– iMerchantOct 1, 2017 at 13:09
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$\begingroup$ Sometimes, picking up terrestrial radio signals is a problem. $\endgroup$– MickOct 2, 2017 at 2:23
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$\begingroup$ Only if the aliens want to talk to you specifically. They tell me I'm one of a very select group. $\endgroup$– Carl WitthoftOct 2, 2017 at 12:24
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This is like asking "can I spot polar bears from my back garden?"
There is nothing that would stop a determined polar bear from coming into my garden, so it is not impossible. But unless you live in Churchill, its probably not going to happen.
You can get a radio telescope, and it would be able to receive a sufficiently powerful signal. But detecting alien signals is hard: so far we haven't detected any. Even with big detectors.
Can you detect aliens: Yes. Will you detect aliens: Probably not.