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You'd be surprised how much you can find out just with a $10 TV tuner dongle and a piece of coax with a short section of the outer braid trimmed off at once end.

You're describing my college tv antenna. Coax is cheap. An actual digital antenna is like... 50 ramen equivalents.

50 ramen = $10 USD

RTL-SDR is the Arduino of EMC work. :)

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