In the spring of my freshman year at Swarthmore, I took E12 Linear Physical System Analysis with Michael Piovoso and Alan Moser. Professor Moser taught the lab course, and for my final lab project in the course, I created a pair of FM radio bandpass filters, one passive, and one active, using the Sallen-Key topology.
You can see the final presentation that we gave in the lab, but it is incomplete. The report's conclusion is that the filter was ineffective, because the final coaxial cable between the filter and the software-defined radio receiver was unshielded, and was acting as an antenna post-filter. Thankfully, during the presentation, Professor Moser located a shielded cable and we were able to demonstrate the expected functionality on the spot. The filter successfully silenced signals outside the commercial FM band, and the quality of signals in the FM band was greatly improved.