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I found this one relatively recently and like the look of it.  It is a kit meant to feed into a meter....but I suspect it would work into a scope as well.


It picks up RF and demodulates it.... but it is not tuned for any particular "band".  That makes it great for probing around in RF circuits to see whether or not they are alive.


He asks $15 for that kit and that is not too bad.


[URL unfurl="true"]https://www.qrpkits.com/rfprobe.html[/URL]