How can we interpret signals from extraterrestrials when we struggle to communicate amongst ourselves?

My new book (out now in the UK, out in the US on Jan 13) "Mixed Signals" delves into how the Cold War forged SETI and radio astronomy as we know it.

https://www.politybooks.com/bookdetail?book_slug=mixed-signals-alien-communication-across-the-iron-curtain--9781509556915
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