At a startup I worked for, we had a cheap wireless microphone and speaker from Craigslist that we used for all-hands meetings. The UX for anybody remote (pre-pandemic, but board members did like to dial in) was terrible - IT would just place a laptop pointed at the speaker. The audio quality left a lot to be desired.

At some point, I pitched the silly idea to IT that I'd figure out what frequency the mic ran at, tune it with gqrx and an SDR, then feed it back to my own microphone using a loopback device in PulseAudio. That day, we had our best-ever voice quality on the remote call, I ended up becoming critical path for all-hands meetings.

Fast forward a few months, the only thing that saved us from building a Raspberry Pi + SDR + Zoom box was another round of funding, with which we bought a proper conferencing system.