Suppose I am a hobbyist with some basic test equipment (an oscilloscope) and parts, and I'd like to do some basically qualitative or comparison of RF emissions of home-built projects. Nothing that would pass for actual product testing, of course, but ... something that would allow you to look at a PCB vs a breadboard, or "look at how emissions go up if I attach a 6inch wire to the micro's crystal oscillator output!", or (perhaps most importantly?) "this is terrible" vs "this doesn't look too bad."
I guess it'd essentially be a sort of broad-spectrum radio receiver with a "received power" indication?
Is that possible? Reasonable to construct from ordinary parts? I don't really care about specific frequencies (I don't think.) Just sort of overall "leakiness"...