RadioShack sold "PZM" microphones made by Crown
have one around here somewhere haven't used it in ages
"RatShack" Realistic also sold microphones made by Shure(sm58s) & EV
sort of like the "Realistic" Moog MG1
They are Quality
awesome inexpensive "Realistic" microphones
for fraction of price of the actual official branded same model microphones on ebay
because very few comprehend the model numbers of those "Realistic" microphones
see them going "cheap"
BTW dragging PZM around the garage is obviously not how boundary microphones are designed for being used recording
admit have done things like that before with PZM treating it as large metal plate piezo contact microphone
yet mine still works :P
https://tapeop.com/tutorials/1/pzm/